{"id":"https://openalex.org/W2169496382","doi":"https://doi.org/10.1109/bibe.2012.6399712","title":"Time-frequency analysis of heart rate variability for sleep and wake classification","display_name":"Time-frequency analysis of heart rate variability for sleep and wake classification","publication_year":2012,"publication_date":"2012-11-01","ids":{"openalex":"https://openalex.org/W2169496382","doi":"https://doi.org/10.1109/bibe.2012.6399712","mag":"2169496382"},"language":"en","primary_location":{"id":"doi:10.1109/bibe.2012.6399712","is_oa":false,"landing_page_url":"https://doi.org/10.1109/bibe.2012.6399712","pdf_url":null,"source":null,"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"2012 IEEE 12th International Conference on Bioinformatics &amp; Bioengineering (BIBE)","raw_type":"proceedings-article"},"type":"article","indexed_in":["crossref"],"open_access":{"is_oa":true,"oa_status":"green","oa_url":"https://research.tue.nl/en/publications/066cc711-16d8-46d1-bfbf-fb5c45da2350","any_repository_has_fulltext":true},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5068231985","display_name":"Xi Long","orcid":"https://orcid.org/0000-0001-9505-1270"},"institutions":[{"id":"https://openalex.org/I4210122849","display_name":"Philips (Netherlands)","ror":"https://ror.org/02p2bgp27","country_code":"NL","type":"company","lineage":["https://openalex.org/I4210122849"]}],"countries":["NL"],"is_corresponding":true,"raw_author_name":"Xi Long","raw_affiliation_strings":["Philips Research and TU Eindhoven, Eindhoven, The Netherlands"],"affiliations":[{"raw_affiliation_string":"Philips Research and TU Eindhoven, Eindhoven, The Netherlands","institution_ids":["https://openalex.org/I4210122849"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5074377426","display_name":"Pedro Fonseca","orcid":"https://orcid.org/0000-0003-2932-6402"},"institutions":[{"id":"https://openalex.org/I887968799","display_name":"RWTH Aachen University","ror":"https://ror.org/04xfq0f34","country_code":"DE","type":"education","lineage":["https://openalex.org/I887968799"]}],"countries":["DE"],"is_corresponding":false,"raw_author_name":"Pedro Fonseca","raw_affiliation_strings":["RWTH Aachen University, Aachen, Germany"],"affiliations":[{"raw_affiliation_string":"RWTH Aachen University, Aachen, Germany","institution_ids":["https://openalex.org/I887968799"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5064487766","display_name":"Reinder Haakma","orcid":"https://orcid.org/0000-0002-7245-7072"},"institutions":[{"id":"https://openalex.org/I4210122849","display_name":"Philips (Netherlands)","ror":"https://ror.org/02p2bgp27","country_code":"NL","type":"company","lineage":["https://openalex.org/I4210122849"]}],"countries":["NL"],"is_corresponding":false,"raw_author_name":"Reinder Haakma","raw_affiliation_strings":["Philips Research, Eindhoven, The Netherlands"],"affiliations":[{"raw_affiliation_string":"Philips Research, Eindhoven, The Netherlands","institution_ids":["https://openalex.org/I4210122849"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5040056296","display_name":"Ronald M. Aarts","orcid":"https://orcid.org/0000-0003-3194-0700"},"institutions":[{"id":"https://openalex.org/I4210122849","display_name":"Philips (Netherlands)","ror":"https://ror.org/02p2bgp27","country_code":"NL","type":"company","lineage":["https://openalex.org/I4210122849"]}],"countries":["NL"],"is_corresponding":false,"raw_author_name":"Ronald M. Aarts","raw_affiliation_strings":["Philips Research, Eindhoven, The Netherlands"],"affiliations":[{"raw_affiliation_string":"Philips Research, Eindhoven, The Netherlands","institution_ids":["https://openalex.org/I4210122849"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5023196572","display_name":"J\u00e9r\u00f4me Foussier","orcid":null},"institutions":[{"id":"https://openalex.org/I887968799","display_name":"RWTH Aachen University","ror":"https://ror.org/04xfq0f34","country_code":"DE","type":"education","lineage":["https://openalex.org/I887968799"]}],"countries":["DE"],"is_corresponding":false,"raw_author_name":"Jerome Foussier","raw_affiliation_strings":["RWTH Aachen University, Aachen, Germany"],"affiliations":[{"raw_affiliation_string":"RWTH Aachen University, Aachen, Germany","institution_ids":["https://openalex.org/I887968799"]}]}],"institutions":[],"countries_distinct_count":2,"institutions_distinct_count":5,"corresponding_author_ids":["https://openalex.org/A5068231985"],"corresponding_institution_ids":["https://openalex.org/I4210122849"],"apc_list":null,"apc_paid":null,"fwci":1.7048,"has_fulltext":false,"cited_by_count":20,"citation_normalized_percentile":{"value":0.86256929,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":89,"max":98},"biblio":{"volume":"19","issue":null,"first_page":"85","last_page":"90"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T10745","display_name":"Heart Rate Variability and Autonomic Control","score":0.9998999834060669,"subfield":{"id":"https://openalex.org/subfields/2705","display_name":"Cardiology and Cardiovascular Medicine"},"field":{"id":"https://openalex.org/fields/27","display_name":"Medicine"},"domain":{"id":"https://openalex.org/domains/4","display_name":"Health Sciences"}},"topics":[{"id":"https://openalex.org/T10745","display_name":"Heart Rate Variability and Autonomic Control","score":0.9998999834060669,"subfield":{"id":"https://openalex.org/subfields/2705","display_name":"Cardiology and Cardiovascular Medicine"},"field":{"id":"https://openalex.org/fields/27","display_name":"Medicine"},"domain":{"id":"https://openalex.org/domains/4","display_name":"Health Sciences"}},{"id":"https://openalex.org/T11196","display_name":"Non-Invasive Vital Sign Monitoring","score":0.9994000196456909,"subfield":{"id":"https://openalex.org/subfields/2204","display_name":"Biomedical Engineering"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10429","display_name":"EEG and Brain-Computer Interfaces","score":0.9980000257492065,"subfield":{"id":"https://openalex.org/subfields/2805","display_name":"Cognitive Neuroscience"},"field":{"id":"https://openalex.org/fields/28","display_name":"Neuroscience"},"domain":{"id":"https://openalex.org/domains/1","display_name":"Life Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/heart-rate-variability","display_name":"Heart rate variability","score":0.8966503739356995},{"id":"https://openalex.org/keywords/discriminative-model","display_name":"Discriminative model","score":0.5733574032783508},{"id":"https://openalex.org/keywords/wake","display_name":"Wake","score":0.5374112725257874},{"id":"https://openalex.org/keywords/polysomnography","display_name":"Polysomnography","score":0.531446635723114},{"id":"https://openalex.org/keywords/frequency-band","display_name":"Frequency band","score":0.5294114351272583},{"id":"https://openalex.org/keywords/pattern-recognition","display_name":"Pattern recognition (psychology)","score":0.490875780582428},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.4673877954483032},{"id":"https://openalex.org/keywords/speech-recognition","display_name":"Speech recognition","score":0.45158323645591736},{"id":"https://openalex.org/keywords/spectral-analysis","display_name":"Spectral analysis","score":0.4409603178501129},{"id":"https://openalex.org/keywords/artificial-intelligence","display_name":"Artificial intelligence","score":0.43467384576797485},{"id":"https://openalex.org/keywords/time\u2013frequency-analysis","display_name":"Time\u2013frequency analysis","score":0.43058034777641296},{"id":"https://openalex.org/keywords/spectral-density","display_name":"Spectral density","score":0.42245835065841675},{"id":"https://openalex.org/keywords/heart-rate","display_name":"Heart rate","score":0.258766770362854},{"id":"https://openalex.org/keywords/medicine","display_name":"Medicine","score":0.2004876434803009},{"id":"https://openalex.org/keywords/bandwidth","display_name":"Bandwidth (computing)","score":0.16551604866981506},{"id":"https://openalex.org/keywords/physics","display_name":"Physics","score":0.15047618746757507},{"id":"https://openalex.org/keywords/psychology","display_name":"Psychology","score":0.14006781578063965},{"id":"https://openalex.org/keywords/telecommunications","display_name":"Telecommunications","score":0.13569319248199463},{"id":"https://openalex.org/keywords/electroencephalography","display_name":"Electroencephalography","score":0.12676912546157837},{"id":"https://openalex.org/keywords/internal-medicine","display_name":"Internal medicine","score":0.09560048580169678},{"id":"https://openalex.org/keywords/neuroscience","display_name":"Neuroscience","score":0.07455679774284363}],"concepts":[{"id":"https://openalex.org/C71635504","wikidata":"https://www.wikidata.org/wiki/Q933954","display_name":"Heart rate variability","level":4,"score":0.8966503739356995},{"id":"https://openalex.org/C97931131","wikidata":"https://www.wikidata.org/wiki/Q5282087","display_name":"Discriminative model","level":2,"score":0.5733574032783508},{"id":"https://openalex.org/C48939323","wikidata":"https://www.wikidata.org/wiki/Q294879","display_name":"Wake","level":2,"score":0.5374112725257874},{"id":"https://openalex.org/C2778205975","wikidata":"https://www.wikidata.org/wiki/Q1754874","display_name":"Polysomnography","level":3,"score":0.531446635723114},{"id":"https://openalex.org/C2778116611","wikidata":"https://www.wikidata.org/wiki/Q25110567","display_name":"Frequency band","level":3,"score":0.5294114351272583},{"id":"https://openalex.org/C153180895","wikidata":"https://www.wikidata.org/wiki/Q7148389","display_name":"Pattern recognition (psychology)","level":2,"score":0.490875780582428},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.4673877954483032},{"id":"https://openalex.org/C28490314","wikidata":"https://www.wikidata.org/wiki/Q189436","display_name":"Speech recognition","level":1,"score":0.45158323645591736},{"id":"https://openalex.org/C2983668108","wikidata":"https://www.wikidata.org/wiki/Q280453","display_name":"Spectral analysis","level":3,"score":0.4409603178501129},{"id":"https://openalex.org/C154945302","wikidata":"https://www.wikidata.org/wiki/Q11660","display_name":"Artificial intelligence","level":1,"score":0.43467384576797485},{"id":"https://openalex.org/C142433447","wikidata":"https://www.wikidata.org/wiki/Q7806653","display_name":"Time\u2013frequency analysis","level":3,"score":0.43058034777641296},{"id":"https://openalex.org/C168110828","wikidata":"https://www.wikidata.org/wiki/Q1331626","display_name":"Spectral density","level":2,"score":0.42245835065841675},{"id":"https://openalex.org/C2777953023","wikidata":"https://www.wikidata.org/wiki/Q1073121","display_name":"Heart rate","level":3,"score":0.258766770362854},{"id":"https://openalex.org/C71924100","wikidata":"https://www.wikidata.org/wiki/Q11190","display_name":"Medicine","level":0,"score":0.2004876434803009},{"id":"https://openalex.org/C2776257435","wikidata":"https://www.wikidata.org/wiki/Q1576430","display_name":"Bandwidth (computing)","level":2,"score":0.16551604866981506},{"id":"https://openalex.org/C121332964","wikidata":"https://www.wikidata.org/wiki/Q413","display_name":"Physics","level":0,"score":0.15047618746757507},{"id":"https://openalex.org/C15744967","wikidata":"https://www.wikidata.org/wiki/Q9418","display_name":"Psychology","level":0,"score":0.14006781578063965},{"id":"https://openalex.org/C76155785","wikidata":"https://www.wikidata.org/wiki/Q418","display_name":"Telecommunications","level":1,"score":0.13569319248199463},{"id":"https://openalex.org/C522805319","wikidata":"https://www.wikidata.org/wiki/Q179965","display_name":"Electroencephalography","level":2,"score":0.12676912546157837},{"id":"https://openalex.org/C126322002","wikidata":"https://www.wikidata.org/wiki/Q11180","display_name":"Internal medicine","level":1,"score":0.09560048580169678},{"id":"https://openalex.org/C169760540","wikidata":"https://www.wikidata.org/wiki/Q207011","display_name":"Neuroscience","level":1,"score":0.07455679774284363},{"id":"https://openalex.org/C97355855","wikidata":"https://www.wikidata.org/wiki/Q11473","display_name":"Thermodynamics","level":1,"score":0.0},{"id":"https://openalex.org/C84393581","wikidata":"https://www.wikidata.org/wiki/Q82642","display_name":"Blood pressure","level":2,"score":0.0},{"id":"https://openalex.org/C554190296","wikidata":"https://www.wikidata.org/wiki/Q47528","display_name":"Radar","level":2,"score":0.0},{"id":"https://openalex.org/C32891209","wikidata":"https://www.wikidata.org/wiki/Q483666","display_name":"Spectroscopy","level":2,"score":0.0},{"id":"https://openalex.org/C62520636","wikidata":"https://www.wikidata.org/wiki/Q944","display_name":"Quantum mechanics","level":1,"score":0.0}],"mesh":[],"locations_count":6,"locations":[{"id":"doi:10.1109/bibe.2012.6399712","is_oa":false,"landing_page_url":"https://doi.org/10.1109/bibe.2012.6399712","pdf_url":null,"source":null,"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"2012 IEEE 12th International Conference on Bioinformatics &amp; Bioengineering (BIBE)","raw_type":"proceedings-article"},{"id":"pmh:oai:pure.tue.nl:openaire/066cc711-16d8-46d1-bfbf-fb5c45da2350","is_oa":true,"landing_page_url":"https://research.tue.nl/en/publications/066cc711-16d8-46d1-bfbf-fb5c45da2350","pdf_url":null,"source":{"id":"https://openalex.org/S4406922641","display_name":"TU/e Research Portal","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"host_organization":null,"host_organization_name":null,"host_organization_lineage":[],"host_organization_lineage_names":[],"type":"repository"},"license":"other-oa","license_id":"https://openalex.org/licenses/other-oa","version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Long, X, Fonseca, P, Haakma, R, Aarts, R M & Foussier, J 2012, Time-frequency analysis of heart rate variability for sleep and wake classification. in Proceedings of IEEE 12th International Conference on BioInformatics and BioEngineering (BIBE2012), 11-13 November 2012, Larnaca, Cyprus. Institute of Electrical and Electronics Engineers, Piscataway, pp. 85-90. https://doi.org/10.1109/BIBE.2012.6399712","raw_type":"info:eu-repo/semantics/publishedVersion"},{"id":"pmh:748694","is_oa":false,"landing_page_url":"http://library.tue.nl/csp/dare/LinkToRepository.csp?recordnumber=748694","pdf_url":null,"source":{"id":"https://openalex.org/S4406923046","display_name":"TU/e Research Portal (Eindhoven University of Technology)","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"host_organization":null,"host_organization_name":null,"host_organization_lineage":[],"host_organization_lineage_names":[],"type":"repository"},"license":null,"license_id":null,"version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"","raw_type":""},{"id":"pmh:oai:library.tue.nl:748694","is_oa":false,"landing_page_url":"http://repository.tue.nl/748694","pdf_url":null,"source":{"id":"https://openalex.org/S4406923046","display_name":"TU/e Research Portal (Eindhoven University of Technology)","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"host_organization":null,"host_organization_name":null,"host_organization_lineage":[],"host_organization_lineage_names":[],"type":"repository"},"license":null,"license_id":null,"version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"","raw_type":""},{"id":"pmh:philips:oai:tudelft.nl:uuid:23771393-c388-44b4-8caf-14bd079b4e66","is_oa":true,"landing_page_url":"http://resolver.tudelft.nl/uuid:23771393-c388-44b4-8caf-14bd079b4e66","pdf_url":null,"source":{"id":"https://openalex.org/S4306401843","display_name":"Data Archiving and Networked Services (DANS)","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"host_organization":"https://openalex.org/I1322597698","host_organization_name":"Royal Netherlands Academy of Arts and Sciences","host_organization_lineage":["https://openalex.org/I1322597698"],"host_organization_lineage_names":[],"type":"repository"},"license":"other-oa","license_id":"https://openalex.org/licenses/other-oa","version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"","raw_type":"info:eu-repo/semantics/conferencepaper"},{"id":"pmh:tue:oai:pure.tue.nl:publications/066cc711-16d8-46d1-bfbf-fb5c45da2350","is_oa":true,"landing_page_url":"https://research.tue.nl/nl/publications/066cc711-16d8-46d1-bfbf-fb5c45da2350","pdf_url":null,"source":{"id":"https://openalex.org/S4306401843","display_name":"Data Archiving and Networked Services (DANS)","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"host_organization":"https://openalex.org/I1322597698","host_organization_name":"Royal Netherlands Academy of Arts and Sciences","host_organization_lineage":["https://openalex.org/I1322597698"],"host_organization_lineage_names":[],"type":"repository"},"license":"other-oa","license_id":"https://openalex.org/licenses/other-oa","version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"Proceedings of IEEE 12th International Conference on BioInformatics and BioEngineering (BIBE2012), 11-13 November 2012, Larnaca, Cyprus, 85 - 90","raw_type":"info:eu-repo/semantics/conferencepaper"}],"best_oa_location":{"id":"pmh:oai:pure.tue.nl:openaire/066cc711-16d8-46d1-bfbf-fb5c45da2350","is_oa":true,"landing_page_url":"https://research.tue.nl/en/publications/066cc711-16d8-46d1-bfbf-fb5c45da2350","pdf_url":null,"source":{"id":"https://openalex.org/S4406922641","display_name":"TU/e Research Portal","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"host_organization":null,"host_organization_name":null,"host_organization_lineage":[],"host_organization_lineage_names":[],"type":"repository"},"license":"other-oa","license_id":"https://openalex.org/licenses/other-oa","version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Long, X, Fonseca, P, Haakma, R, Aarts, R M & Foussier, J 2012, Time-frequency analysis of heart rate variability for sleep and wake classification. in Proceedings of IEEE 12th International Conference on BioInformatics and BioEngineering (BIBE2012), 11-13 November 2012, Larnaca, Cyprus. Institute of Electrical and Electronics Engineers, Piscataway, pp. 85-90. https://doi.org/10.1109/BIBE.2012.6399712","raw_type":"info:eu-repo/semantics/publishedVersion"},"sustainable_development_goals":[{"display_name":"Reduced inequalities","id":"https://metadata.un.org/sdg/10","score":0.7400000095367432}],"awards":[],"funders":[],"has_content":{"grobid_xml":false,"pdf":false},"content_urls":null,"referenced_works_count":35,"referenced_works":["https://openalex.org/W50605923","https://openalex.org/W53985144","https://openalex.org/W1565688196","https://openalex.org/W1880547552","https://openalex.org/W1972034440","https://openalex.org/W1976526581","https://openalex.org/W1998627270","https://openalex.org/W2022954200","https://openalex.org/W2045656688","https://openalex.org/W2059851411","https://openalex.org/W2062618262","https://openalex.org/W2082749222","https://openalex.org/W2087361786","https://openalex.org/W2101709445","https://openalex.org/W2104614052","https://openalex.org/W2112400936","https://openalex.org/W2120760055","https://openalex.org/W2120964583","https://openalex.org/W2125109199","https://openalex.org/W2128870545","https://openalex.org/W2133589238","https://openalex.org/W2134726485","https://openalex.org/W2146005896","https://openalex.org/W2162149891","https://openalex.org/W2164759525","https://openalex.org/W2169567849","https://openalex.org/W2261584226","https://openalex.org/W2285072859","https://openalex.org/W2525537354","https://openalex.org/W2884525847","https://openalex.org/W3166543270","https://openalex.org/W4285719527","https://openalex.org/W4293743754","https://openalex.org/W6602011570","https://openalex.org/W6692785609"],"related_works":["https://openalex.org/W2134077893","https://openalex.org/W2149215902","https://openalex.org/W2625477129","https://openalex.org/W2134296345","https://openalex.org/W1543280747","https://openalex.org/W2329439512","https://openalex.org/W2054556067","https://openalex.org/W2474096446","https://openalex.org/W1563584308","https://openalex.org/W2169496382"],"abstract_inverted_index":{"This":[0,103],"paper":[1],"describes":[2],"a":[3,155,186],"method":[4,183],"to":[5,75,108,136],"adapt":[6,144],"the":[7,37,44,109,112,118,122,127,138,145,164,168,190],"spectral":[8,39,95,147,171],"features":[9,40,172],"extracted":[10,42],"from":[11,26,31,43,158],"heart":[12],"rate":[13],"variability":[14],"(HRV)":[15],"for":[16],"sleep":[17,99,178],"and":[18,63,100,121,179],"wake":[19,101],"classification.":[20,102],"HRV":[21,38,48,94,146,170,202],"series":[22,49],"can":[23],"be":[24],"derived":[25],"electrocardiogram":[27],"(ECG)":[28],"signals":[29],"obtained":[30],"single-night":[32],"polysomnography":[33],"(PSG)":[34],"recordings.":[35],"Traditionally,":[36],"are":[41,70,173],"spectrum":[45],"of":[46,55,80,140,167,189],"an":[47],"with":[50,198],"fixed":[51],"boundaries":[52,148],"specifying":[53],"bands":[54],"very":[56],"low":[57,60],"frequency":[58,61,65],"(VLF),":[59],"(LF),":[62],"high":[64],"(HF).":[66],"However,":[67],"because":[68],"they":[69,72],"fixed,":[71],"may":[73,87],"fail":[74],"accurately":[76],"reflect":[77],"certain":[78],"aspects":[79],"autonomic":[81],"nervous":[82],"activity,":[83],"which":[84],"in":[85,98,105,117,126,196],"turn":[86],"limit":[88],"their":[89],"discriminative":[90,165],"power":[91,166],"when":[92,176,194],"using":[93,149],"features,":[96],"e.g.,":[97],"is":[104],"part":[106],"related":[107],"fact":[110],"that":[111,163],"sympathetic":[113],"tone":[114],"(partially":[115],"reflected":[116],"LF":[119],"band)":[120,129],"respiratory":[123],"activity":[124],"(modulated":[125],"HF":[128],"will":[130],"vary":[131],"over":[132],"time.":[133],"In":[134],"order":[135],"minimize":[137],"impact":[139],"these":[141],"differences,":[142],"we":[143],"time-frequency":[150],"analysis.":[151],"Experiments":[152],"conducted":[153],"on":[154],"dataset":[156],"acquired":[157],"15":[159],"healthy":[160],"subjects":[161],"show":[162],"adapted":[169],"significantly":[174],"increased":[175],"classifying":[177],"wake.":[180],"Additionally,":[181],"this":[182],"also":[184],"provides":[185],"significant":[187],"improvement":[188],"overall":[191],"classification":[192],"performance":[193],"used":[195],"combination":[197],"some":[199],"other":[200],"(non-spectral)":[201],"features.":[203]},"counts_by_year":[{"year":2023,"cited_by_count":1},{"year":2020,"cited_by_count":1},{"year":2019,"cited_by_count":2},{"year":2018,"cited_by_count":2},{"year":2017,"cited_by_count":3},{"year":2016,"cited_by_count":2},{"year":2015,"cited_by_count":5},{"year":2014,"cited_by_count":2},{"year":2013,"cited_by_count":2}],"updated_date":"2026-04-05T17:49:38.594831","created_date":"2025-10-10T00:00:00"}
