{"id":"https://openalex.org/W2914869971","doi":"https://doi.org/10.3233/fi-1994-201233","title":"SQUARE SYSTEMS","display_name":"SQUARE SYSTEMS","publication_year":1994,"publication_date":"1994-01-01","ids":{"openalex":"https://openalex.org/W2914869971","doi":"https://doi.org/10.3233/fi-1994-201233","mag":"2914869971"},"language":"en","primary_location":{"id":"doi:10.3233/fi-1994-201233","is_oa":false,"landing_page_url":"https://doi.org/10.3233/fi-1994-201233","pdf_url":null,"source":{"id":"https://openalex.org/S39012697","display_name":"Fundamenta Informaticae","issn_l":"0169-2968","issn":["0169-2968","1875-8681"],"is_oa":false,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310318577","host_organization_name":"IOS Press","host_organization_lineage":["https://openalex.org/P4310318577"],"host_organization_lineage_names":["IOS Press"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Fundamenta Informaticae","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/A5045244980","display_name":"Andrzej Ehrenfeucht","orcid":null},"institutions":[{"id":"https://openalex.org/I188538660","display_name":"University of Colorado Boulder","ror":"https://ror.org/02ttsq026","country_code":"US","type":"education","lineage":["https://openalex.org/I188538660"]}],"countries":["US"],"is_corresponding":false,"raw_author_name":"A. Ehrenfeucht","raw_affiliation_strings":["Department of Computer Science, University of Colorado at Boulder, Boulder, CO 80309, U.S.A"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Department of Computer Science, University of Colorado at Boulder, Boulder, CO 80309, U.S.A","institution_ids":["https://openalex.org/I188538660"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5110486000","display_name":"Grzegorz Rozenberg","orcid":null},"institutions":[{"id":"https://openalex.org/I121797337","display_name":"Leiden University","ror":"https://ror.org/027bh9e22","country_code":"NL","type":"education","lineage":["https://openalex.org/I121797337"]},{"id":"https://openalex.org/I188538660","display_name":"University of Colorado Boulder","ror":"https://ror.org/02ttsq026","country_code":"US","type":"education","lineage":["https://openalex.org/I188538660"]},{"id":"https://openalex.org/I210716285","display_name":"University of Applied Sciences Leiden","ror":"https://ror.org/0093src13","country_code":"NL","type":"education","lineage":["https://openalex.org/I210716285"]}],"countries":["NL","US"],"is_corresponding":false,"raw_author_name":"G. Rozenberg","raw_affiliation_strings":["Department of Computer Science, Leiden University, P.O. Box 9512, 2300 RA Leiden, The Netherlands and Department of Computer Science, University of Colorado at Boulder, Boulder, CO 80309, U.S.A"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Department of Computer Science, Leiden University, P.O. Box 9512, 2300 RA Leiden, The Netherlands and Department of Computer Science, University of Colorado at Boulder, Boulder, CO 80309, U.S.A","institution_ids":["https://openalex.org/I121797337","https://openalex.org/I188538660","https://openalex.org/I210716285"]}]}],"institutions":[],"countries_distinct_count":2,"institutions_distinct_count":3,"corresponding_author_ids":[],"corresponding_institution_ids":[],"apc_list":null,"apc_paid":null,"fwci":0.4599,"has_fulltext":false,"cited_by_count":5,"citation_normalized_percentile":{"value":0.69268496,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":90,"max":94},"biblio":{"volume":"20","issue":"1,2,3","first_page":"75","last_page":"111"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T10792","display_name":"Matrix Theory and Algorithms","score":0.8557000160217285,"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/T10792","display_name":"Matrix Theory and Algorithms","score":0.8557000160217285,"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"}}],"keywords":[{"id":"https://openalex.org/keywords/square","display_name":"Square (algebra)","score":0.7800573706626892},{"id":"https://openalex.org/keywords/relation","display_name":"Relation (database)","score":0.5500574707984924},{"id":"https://openalex.org/keywords/mathematics","display_name":"Mathematics","score":0.5353465676307678},{"id":"https://openalex.org/keywords/symmetry","display_name":"Symmetry (geometry)","score":0.44059619307518005},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.3691842555999756},{"id":"https://openalex.org/keywords/data-mining","display_name":"Data mining","score":0.07916253805160522},{"id":"https://openalex.org/keywords/geometry","display_name":"Geometry","score":0.06744706630706787}],"concepts":[{"id":"https://openalex.org/C135692309","wikidata":"https://www.wikidata.org/wiki/Q111124","display_name":"Square (algebra)","level":2,"score":0.7800573706626892},{"id":"https://openalex.org/C25343380","wikidata":"https://www.wikidata.org/wiki/Q277521","display_name":"Relation (database)","level":2,"score":0.5500574707984924},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.5353465676307678},{"id":"https://openalex.org/C2779886137","wikidata":"https://www.wikidata.org/wiki/Q21030012","display_name":"Symmetry (geometry)","level":2,"score":0.44059619307518005},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.3691842555999756},{"id":"https://openalex.org/C124101348","wikidata":"https://www.wikidata.org/wiki/Q172491","display_name":"Data mining","level":1,"score":0.07916253805160522},{"id":"https://openalex.org/C2524010","wikidata":"https://www.wikidata.org/wiki/Q8087","display_name":"Geometry","level":1,"score":0.06744706630706787}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.3233/fi-1994-201233","is_oa":false,"landing_page_url":"https://doi.org/10.3233/fi-1994-201233","pdf_url":null,"source":{"id":"https://openalex.org/S39012697","display_name":"Fundamenta Informaticae","issn_l":"0169-2968","issn":["0169-2968","1875-8681"],"is_oa":false,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310318577","host_organization_name":"IOS Press","host_organization_lineage":["https://openalex.org/P4310318577"],"host_organization_lineage_names":["IOS Press"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Fundamenta Informaticae","raw_type":"journal-article"}],"best_oa_location":null,"sustainable_development_goals":[],"awards":[],"funders":[],"has_content":{"pdf":false,"grobid_xml":false},"content_urls":null,"referenced_works_count":1,"referenced_works":["https://openalex.org/W2017906621"],"related_works":["https://openalex.org/W2899084033","https://openalex.org/W2748952813","https://openalex.org/W4391375266","https://openalex.org/W1979597421","https://openalex.org/W2007980826","https://openalex.org/W2061531152","https://openalex.org/W3002753104","https://openalex.org/W2077600819","https://openalex.org/W2142036596","https://openalex.org/W2513736564"],"abstract_inverted_index":{"The":[0,22],"notion":[1],"of":[2,24,34],"a":[3,15,28],"square":[4,25],"system":[5],"is":[6,12],"introduced":[7],"and":[8],"investigated":[9],"-":[10],"it":[11],"based":[13,36],"on":[14,37],"quaternary":[16],"relation":[17],"satisfying":[18],"certain":[19],"symmetry":[20],"conditions.":[21],"theory":[23],"systems":[26,35],"provides":[27],"unifying":[29],"framework":[30],"for":[31],"studying":[32],"decompositions":[33],"hie":[38]},"counts_by_year":[{"year":2017,"cited_by_count":1},{"year":2015,"cited_by_count":1}],"updated_date":"2026-05-02T06:04:40.494371","created_date":"2019-02-21T00:00:00"}
