{"id":"https://openalex.org/W2009392309","doi":"https://doi.org/10.1016/s0012-365x(96)00307-x","title":"Proper interval graphs and the guard problem","display_name":"Proper interval graphs and the guard problem","publication_year":1997,"publication_date":"1997-06-01","ids":{"openalex":"https://openalex.org/W2009392309","doi":"https://doi.org/10.1016/s0012-365x(96)00307-x","mag":"2009392309"},"language":"en","primary_location":{"id":"doi:10.1016/s0012-365x(96)00307-x","is_oa":false,"landing_page_url":"https://doi.org/10.1016/s0012-365x(96)00307-x","pdf_url":null,"source":{"id":"https://openalex.org/S18902827","display_name":"Discrete Mathematics","issn_l":"0012-365X","issn":["0012-365X","1872-681X"],"is_oa":false,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310320990","host_organization_name":"Elsevier BV","host_organization_lineage":["https://openalex.org/P4310320990"],"host_organization_lineage_names":["Elsevier BV"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Discrete Mathematics","raw_type":"journal-article"},"type":"article","indexed_in":["crossref"],"open_access":{"is_oa":false,"oa_status":"closed","oa_url":null,"any_repository_has_fulltext":false},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5021603016","display_name":"Chiuyuan Chen","orcid":"https://orcid.org/0000-0002-3716-3810"},"institutions":[{"id":"https://openalex.org/I148366613","display_name":"National Yang Ming Chiao Tung University","ror":"https://ror.org/00se2k293","country_code":"TW","type":"education","lineage":["https://openalex.org/I148366613"]}],"countries":["TW"],"is_corresponding":true,"raw_author_name":"Chiuyuan Chen","raw_affiliation_strings":["Department of Applied Mathematics National Chiao Tung University Hsinchu 30050, Taiwan"],"affiliations":[{"raw_affiliation_string":"Department of Applied Mathematics National Chiao Tung University Hsinchu 30050, Taiwan","institution_ids":["https://openalex.org/I148366613"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5038550838","display_name":"Chin\u2010Chen Chang","orcid":"https://orcid.org/0000-0002-7319-5780"},"institutions":[{"id":"https://openalex.org/I148366613","display_name":"National Yang Ming Chiao Tung University","ror":"https://ror.org/00se2k293","country_code":"TW","type":"education","lineage":["https://openalex.org/I148366613"]}],"countries":["TW"],"is_corresponding":false,"raw_author_name":"Chin-Chen Chang","raw_affiliation_strings":["Department of Applied Mathematics National Chiao Tung University Hsinchu 30050, Taiwan"],"affiliations":[{"raw_affiliation_string":"Department of Applied Mathematics National Chiao Tung University Hsinchu 30050, Taiwan","institution_ids":["https://openalex.org/I148366613"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5002508116","display_name":"Gerard J. Chang","orcid":null},"institutions":[{"id":"https://openalex.org/I148366613","display_name":"National Yang Ming Chiao Tung University","ror":"https://ror.org/00se2k293","country_code":"TW","type":"education","lineage":["https://openalex.org/I148366613"]}],"countries":["TW"],"is_corresponding":false,"raw_author_name":"Gerard J. Chang","raw_affiliation_strings":["Department of Applied Mathematics National Chiao Tung University Hsinchu 30050, Taiwan"],"affiliations":[{"raw_affiliation_string":"Department of Applied Mathematics National Chiao Tung University Hsinchu 30050, Taiwan","institution_ids":["https://openalex.org/I148366613"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":3,"corresponding_author_ids":["https://openalex.org/A5021603016"],"corresponding_institution_ids":["https://openalex.org/I148366613"],"apc_list":{"value":3000,"currency":"USD","value_usd":3000},"apc_paid":null,"fwci":0.0,"has_fulltext":false,"cited_by_count":23,"citation_normalized_percentile":{"value":0.14479721,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":89,"max":96},"biblio":{"volume":"170","issue":"1-3","first_page":"223","last_page":"230"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T10374","display_name":"Advanced Graph Theory Research","score":0.9993000030517578,"subfield":{"id":"https://openalex.org/subfields/1703","display_name":"Computational Theory and Mathematics"},"field":{"id":"https://openalex.org/fields/17","display_name":"Computer Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},"topics":[{"id":"https://openalex.org/T10374","display_name":"Advanced Graph Theory Research","score":0.9993000030517578,"subfield":{"id":"https://openalex.org/subfields/1703","display_name":"Computational Theory and Mathematics"},"field":{"id":"https://openalex.org/fields/17","display_name":"Computer Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10996","display_name":"Computational Geometry and Mesh Generation","score":0.9896000027656555,"subfield":{"id":"https://openalex.org/subfields/1704","display_name":"Computer Graphics and Computer-Aided Design"},"field":{"id":"https://openalex.org/fields/17","display_name":"Computer Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10661","display_name":"biodegradable polymer synthesis and properties","score":0.975600004196167,"subfield":{"id":"https://openalex.org/subfields/2502","display_name":"Biomaterials"},"field":{"id":"https://openalex.org/fields/25","display_name":"Materials Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/mathematics","display_name":"Mathematics","score":0.8394694328308105},{"id":"https://openalex.org/keywords/combinatorics","display_name":"Combinatorics","score":0.6752179265022278},{"id":"https://openalex.org/keywords/guard","display_name":"Guard (computer science)","score":0.6463346481323242},{"id":"https://openalex.org/keywords/interval","display_name":"Interval (graph theory)","score":0.5771162509918213},{"id":"https://openalex.org/keywords/discrete-mathematics","display_name":"Discrete mathematics","score":0.5327033996582031},{"id":"https://openalex.org/keywords/interval-graph","display_name":"Interval graph","score":0.5322090983390808},{"id":"https://openalex.org/keywords/indifference-graph","display_name":"Indifference graph","score":0.45140278339385986},{"id":"https://openalex.org/keywords/chordal-graph","display_name":"Chordal graph","score":0.4197236895561218},{"id":"https://openalex.org/keywords/graph","display_name":"Graph","score":0.39578330516815186},{"id":"https://openalex.org/keywords/1-planar-graph","display_name":"1-planar graph","score":0.23979482054710388},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.11858189105987549}],"concepts":[{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.8394694328308105},{"id":"https://openalex.org/C114614502","wikidata":"https://www.wikidata.org/wiki/Q76592","display_name":"Combinatorics","level":1,"score":0.6752179265022278},{"id":"https://openalex.org/C141141315","wikidata":"https://www.wikidata.org/wiki/Q2379942","display_name":"Guard (computer science)","level":2,"score":0.6463346481323242},{"id":"https://openalex.org/C2778067643","wikidata":"https://www.wikidata.org/wiki/Q166507","display_name":"Interval (graph theory)","level":2,"score":0.5771162509918213},{"id":"https://openalex.org/C118615104","wikidata":"https://www.wikidata.org/wiki/Q121416","display_name":"Discrete mathematics","level":1,"score":0.5327033996582031},{"id":"https://openalex.org/C67810366","wikidata":"https://www.wikidata.org/wiki/Q835942","display_name":"Interval graph","level":5,"score":0.5322090983390808},{"id":"https://openalex.org/C74133993","wikidata":"https://www.wikidata.org/wiki/Q3115472","display_name":"Indifference graph","level":3,"score":0.45140278339385986},{"id":"https://openalex.org/C160446614","wikidata":"https://www.wikidata.org/wiki/Q1322892","display_name":"Chordal graph","level":3,"score":0.4197236895561218},{"id":"https://openalex.org/C132525143","wikidata":"https://www.wikidata.org/wiki/Q141488","display_name":"Graph","level":2,"score":0.39578330516815186},{"id":"https://openalex.org/C102192266","wikidata":"https://www.wikidata.org/wiki/Q4545823","display_name":"1-planar graph","level":4,"score":0.23979482054710388},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.11858189105987549},{"id":"https://openalex.org/C199360897","wikidata":"https://www.wikidata.org/wiki/Q9143","display_name":"Programming language","level":1,"score":0.0}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1016/s0012-365x(96)00307-x","is_oa":false,"landing_page_url":"https://doi.org/10.1016/s0012-365x(96)00307-x","pdf_url":null,"source":{"id":"https://openalex.org/S18902827","display_name":"Discrete Mathematics","issn_l":"0012-365X","issn":["0012-365X","1872-681X"],"is_oa":false,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310320990","host_organization_name":"Elsevier BV","host_organization_lineage":["https://openalex.org/P4310320990"],"host_organization_lineage_names":["Elsevier BV"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Discrete Mathematics","raw_type":"journal-article"}],"best_oa_location":null,"sustainable_development_goals":[],"awards":[],"funders":[],"has_content":{"grobid_xml":false,"pdf":false},"content_urls":null,"referenced_works_count":16,"referenced_works":["https://openalex.org/W158921567","https://openalex.org/W1484040084","https://openalex.org/W1973307935","https://openalex.org/W1973310391","https://openalex.org/W1999505568","https://openalex.org/W2024491681","https://openalex.org/W2037583329","https://openalex.org/W2043207029","https://openalex.org/W2063909168","https://openalex.org/W2077143033","https://openalex.org/W2089465933","https://openalex.org/W2094338284","https://openalex.org/W2094658339","https://openalex.org/W2986240932","https://openalex.org/W4300303686","https://openalex.org/W6770146337"],"related_works":["https://openalex.org/W2407722793","https://openalex.org/W2408404065","https://openalex.org/W1970195683","https://openalex.org/W2028457162","https://openalex.org/W2962735809","https://openalex.org/W3163002073","https://openalex.org/W2277851392","https://openalex.org/W4290189031","https://openalex.org/W2228789187","https://openalex.org/W2296180642"],"abstract_inverted_index":null,"counts_by_year":[{"year":2025,"cited_by_count":1},{"year":2024,"cited_by_count":1},{"year":2023,"cited_by_count":1},{"year":2022,"cited_by_count":1},{"year":2021,"cited_by_count":2},{"year":2020,"cited_by_count":1},{"year":2019,"cited_by_count":1},{"year":2018,"cited_by_count":1},{"year":2016,"cited_by_count":1},{"year":2015,"cited_by_count":1},{"year":2014,"cited_by_count":1},{"year":2013,"cited_by_count":2},{"year":2012,"cited_by_count":2}],"updated_date":"2025-11-06T03:46:38.306776","created_date":"2025-10-10T00:00:00"}
