{"id":"https://openalex.org/W2044987315","doi":"https://doi.org/10.1007/s00493-014-3132-1","title":"Sabidussi versus Hedetniemi for three variations of the chromatic number","display_name":"Sabidussi versus Hedetniemi for three variations of the chromatic number","publication_year":2015,"publication_date":"2015-01-16","ids":{"openalex":"https://openalex.org/W2044987315","doi":"https://doi.org/10.1007/s00493-014-3132-1","mag":"2044987315"},"language":"en","primary_location":{"id":"doi:10.1007/s00493-014-3132-1","is_oa":false,"landing_page_url":"https://doi.org/10.1007/s00493-014-3132-1","pdf_url":null,"source":{"id":"https://openalex.org/S72366220","display_name":"COMBINATORICA","issn_l":"0209-9683","issn":["0209-9683","1439-6912"],"is_oa":false,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310319900","host_organization_name":"Springer Science+Business Media","host_organization_lineage":["https://openalex.org/P4310319900","https://openalex.org/P4310319965"],"host_organization_lineage_names":["Springer Science+Business Media","Springer Nature"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Combinatorica","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/A5079662904","display_name":"Chris Godsil","orcid":"https://orcid.org/0000-0001-6110-5752"},"institutions":[{"id":"https://openalex.org/I151746483","display_name":"University of Waterloo","ror":"https://ror.org/01aff2v68","country_code":"CA","type":"education","lineage":["https://openalex.org/I151746483"]}],"countries":["CA"],"is_corresponding":true,"raw_author_name":"Chris Godsil","raw_affiliation_strings":["Department of Combinatorics and Optimization, University of Waterloo, Waterloo, Canada","DEPARTMENT OF COMBINATORICS & OPTIMIZATION, UNIVERSITY OF WATERLOO, WATERLOO, CANADA"],"affiliations":[{"raw_affiliation_string":"Department of Combinatorics and Optimization, University of Waterloo, Waterloo, Canada","institution_ids":["https://openalex.org/I151746483"]},{"raw_affiliation_string":"DEPARTMENT OF COMBINATORICS & OPTIMIZATION, UNIVERSITY OF WATERLOO, WATERLOO, CANADA","institution_ids":["https://openalex.org/I151746483"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5023984902","display_name":"David E. Roberson","orcid":"https://orcid.org/0000-0002-4463-8095"},"institutions":[{"id":"https://openalex.org/I151746483","display_name":"University of Waterloo","ror":"https://ror.org/01aff2v68","country_code":"CA","type":"education","lineage":["https://openalex.org/I151746483"]}],"countries":["CA"],"is_corresponding":false,"raw_author_name":"David E. Roberson","raw_affiliation_strings":["Department of Combinatorics and Optimization, University of Waterloo, Waterloo, Canada","DEPARTMENT OF COMBINATORICS & OPTIMIZATION, UNIVERSITY OF WATERLOO, WATERLOO, CANADA"],"affiliations":[{"raw_affiliation_string":"Department of Combinatorics and Optimization, University of Waterloo, Waterloo, Canada","institution_ids":["https://openalex.org/I151746483"]},{"raw_affiliation_string":"DEPARTMENT OF COMBINATORICS & OPTIMIZATION, UNIVERSITY OF WATERLOO, WATERLOO, CANADA","institution_ids":["https://openalex.org/I151746483"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5081562141","display_name":"Robert \u0160\u00e1mal","orcid":"https://orcid.org/0000-0002-0172-6511"},"institutions":[{"id":"https://openalex.org/I21250087","display_name":"Charles University","ror":"https://ror.org/024d6js02","country_code":"CZ","type":"education","lineage":["https://openalex.org/I21250087"]}],"countries":["CZ"],"is_corresponding":false,"raw_author_name":"Robert \u0160\u00e1mal","raw_affiliation_strings":["Computer Science Institute of Charles University, Prague, Czech Republic","COMPUTER SCIENCE INSTITUTE OF CHARLES UNIVERSITY; PRAGUE CZECH REPUBLIC"],"affiliations":[{"raw_affiliation_string":"Computer Science Institute of Charles University, Prague, Czech Republic","institution_ids":["https://openalex.org/I21250087"]},{"raw_affiliation_string":"COMPUTER SCIENCE INSTITUTE OF CHARLES UNIVERSITY; PRAGUE CZECH REPUBLIC","institution_ids":[]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5064938440","display_name":"Simone Severini","orcid":"https://orcid.org/0000-0001-7305-6759"},"institutions":[{"id":"https://openalex.org/I45129253","display_name":"University College London","ror":"https://ror.org/02jx3x895","country_code":"GB","type":"education","lineage":["https://openalex.org/I124357947","https://openalex.org/I45129253"]}],"countries":["GB"],"is_corresponding":false,"raw_author_name":"Simone Severini","raw_affiliation_strings":["Department of Computer Science, University College London, London, UK","Dept. of Comput. Sci., Univ. Coll. London, London, UK#TAB#"],"affiliations":[{"raw_affiliation_string":"Department of Computer Science, University College London, London, UK","institution_ids":["https://openalex.org/I45129253"]},{"raw_affiliation_string":"Dept. of Comput. Sci., Univ. Coll. London, London, UK#TAB#","institution_ids":["https://openalex.org/I45129253"]}]}],"institutions":[],"countries_distinct_count":3,"institutions_distinct_count":4,"corresponding_author_ids":["https://openalex.org/A5079662904"],"corresponding_institution_ids":["https://openalex.org/I151746483"],"apc_list":null,"apc_paid":null,"fwci":2.6994,"has_fulltext":false,"cited_by_count":23,"citation_normalized_percentile":{"value":0.88842681,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":90,"max":98},"biblio":{"volume":"36","issue":"4","first_page":"395","last_page":"415"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T10287","display_name":"Algebraic structures and combinatorial models","score":0.9889000058174133,"subfield":{"id":"https://openalex.org/subfields/2608","display_name":"Geometry and Topology"},"field":{"id":"https://openalex.org/fields/26","display_name":"Mathematics"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},"topics":[{"id":"https://openalex.org/T10287","display_name":"Algebraic structures and combinatorial models","score":0.9889000058174133,"subfield":{"id":"https://openalex.org/subfields/2608","display_name":"Geometry and Topology"},"field":{"id":"https://openalex.org/fields/26","display_name":"Mathematics"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10374","display_name":"Advanced Graph Theory Research","score":0.9825999736785889,"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/T12149","display_name":"Nanocluster Synthesis and Applications","score":0.9793999791145325,"subfield":{"id":"https://openalex.org/subfields/2505","display_name":"Materials Chemistry"},"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/cartesian-product","display_name":"Cartesian product","score":0.8641046285629272},{"id":"https://openalex.org/keywords/mathematics","display_name":"Mathematics","score":0.8572918176651001},{"id":"https://openalex.org/keywords/combinatorics","display_name":"Combinatorics","score":0.7515792846679688},{"id":"https://openalex.org/keywords/conjecture","display_name":"Conjecture","score":0.7113535404205322},{"id":"https://openalex.org/keywords/chromatic-scale","display_name":"Chromatic scale","score":0.6104336977005005},{"id":"https://openalex.org/keywords/homomorphism","display_name":"Homomorphism","score":0.502683162689209},{"id":"https://openalex.org/keywords/product","display_name":"Product (mathematics)","score":0.5013587474822998},{"id":"https://openalex.org/keywords/graph","display_name":"Graph","score":0.4967089295387268},{"id":"https://openalex.org/keywords/discrete-mathematics","display_name":"Discrete mathematics","score":0.4255185127258301},{"id":"https://openalex.org/keywords/geometry","display_name":"Geometry","score":0.11352592706680298}],"concepts":[{"id":"https://openalex.org/C65236422","wikidata":"https://www.wikidata.org/wiki/Q173740","display_name":"Cartesian product","level":2,"score":0.8641046285629272},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.8572918176651001},{"id":"https://openalex.org/C114614502","wikidata":"https://www.wikidata.org/wiki/Q76592","display_name":"Combinatorics","level":1,"score":0.7515792846679688},{"id":"https://openalex.org/C2780990831","wikidata":"https://www.wikidata.org/wiki/Q319141","display_name":"Conjecture","level":2,"score":0.7113535404205322},{"id":"https://openalex.org/C196956537","wikidata":"https://www.wikidata.org/wiki/Q202021","display_name":"Chromatic scale","level":2,"score":0.6104336977005005},{"id":"https://openalex.org/C4042151","wikidata":"https://www.wikidata.org/wiki/Q215111","display_name":"Homomorphism","level":2,"score":0.502683162689209},{"id":"https://openalex.org/C90673727","wikidata":"https://www.wikidata.org/wiki/Q901718","display_name":"Product (mathematics)","level":2,"score":0.5013587474822998},{"id":"https://openalex.org/C132525143","wikidata":"https://www.wikidata.org/wiki/Q141488","display_name":"Graph","level":2,"score":0.4967089295387268},{"id":"https://openalex.org/C118615104","wikidata":"https://www.wikidata.org/wiki/Q121416","display_name":"Discrete mathematics","level":1,"score":0.4255185127258301},{"id":"https://openalex.org/C2524010","wikidata":"https://www.wikidata.org/wiki/Q8087","display_name":"Geometry","level":1,"score":0.11352592706680298}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1007/s00493-014-3132-1","is_oa":false,"landing_page_url":"https://doi.org/10.1007/s00493-014-3132-1","pdf_url":null,"source":{"id":"https://openalex.org/S72366220","display_name":"COMBINATORICA","issn_l":"0209-9683","issn":["0209-9683","1439-6912"],"is_oa":false,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310319900","host_organization_name":"Springer Science+Business Media","host_organization_lineage":["https://openalex.org/P4310319900","https://openalex.org/P4310319965"],"host_organization_lineage_names":["Springer Science+Business Media","Springer Nature"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Combinatorica","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":28,"referenced_works":["https://openalex.org/W126388424","https://openalex.org/W247697463","https://openalex.org/W655258421","https://openalex.org/W987035227","https://openalex.org/W1527197079","https://openalex.org/W1548134571","https://openalex.org/W1572041907","https://openalex.org/W1631356911","https://openalex.org/W1649877900","https://openalex.org/W1798981749","https://openalex.org/W1966674237","https://openalex.org/W1997799442","https://openalex.org/W2004030389","https://openalex.org/W2045522120","https://openalex.org/W2054183197","https://openalex.org/W2069816168","https://openalex.org/W2078289947","https://openalex.org/W2078345446","https://openalex.org/W2086290259","https://openalex.org/W2099452567","https://openalex.org/W2114189119","https://openalex.org/W2116397277","https://openalex.org/W2764347725","https://openalex.org/W3102212064","https://openalex.org/W3190033497","https://openalex.org/W4238591275","https://openalex.org/W4239534271","https://openalex.org/W4298227433"],"related_works":["https://openalex.org/W4390092675","https://openalex.org/W2353823005","https://openalex.org/W2154008353","https://openalex.org/W4366733366","https://openalex.org/W3137798114","https://openalex.org/W4378087371","https://openalex.org/W2364608040","https://openalex.org/W2998748068","https://openalex.org/W3190844188","https://openalex.org/W3178681420"],"abstract_inverted_index":null,"counts_by_year":[{"year":2025,"cited_by_count":5},{"year":2024,"cited_by_count":1},{"year":2023,"cited_by_count":4},{"year":2021,"cited_by_count":2},{"year":2020,"cited_by_count":3},{"year":2019,"cited_by_count":3},{"year":2018,"cited_by_count":2},{"year":2017,"cited_by_count":2},{"year":2015,"cited_by_count":1}],"updated_date":"2025-11-06T03:46:38.306776","created_date":"2025-10-10T00:00:00"}
