{"id":"https://openalex.org/W2014331704","doi":"https://doi.org/10.1016/0166-218x(95)00081-2","title":"The Clar covering polynomial of hexagonal systems I","display_name":"The Clar covering polynomial of hexagonal systems I","publication_year":1996,"publication_date":"1996-08-01","ids":{"openalex":"https://openalex.org/W2014331704","doi":"https://doi.org/10.1016/0166-218x(95)00081-2","mag":"2014331704"},"language":"en","primary_location":{"id":"doi:10.1016/0166-218x(95)00081-2","is_oa":false,"landing_page_url":"https://doi.org/10.1016/0166-218x(95)00081-2","pdf_url":null,"source":{"id":"https://openalex.org/S171741597","display_name":"Discrete Applied Mathematics","issn_l":"0166-218X","issn":["0166-218X","1872-6771"],"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 Applied Mathematics","raw_type":"journal-article"},"type":"article","indexed_in":["crossref"],"open_access":{"is_oa":true,"oa_status":"green","oa_url":"http://ir.lzu.edu.cn/handle/262010/117505","any_repository_has_fulltext":true},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5056609757","display_name":"Heping Zhang","orcid":"https://orcid.org/0000-0001-5385-6687"},"institutions":[{"id":"https://openalex.org/I76214153","display_name":"Lanzhou University","ror":"https://ror.org/01mkqqe32","country_code":"CN","type":"education","lineage":["https://openalex.org/I76214153"]}],"countries":["CN"],"is_corresponding":true,"raw_author_name":"Heping Zhang","raw_affiliation_strings":["Department of Mathematics, Lanzhou University, Lanzhou, Gansu 730000, People's Republic of China","Department of Mathematics, Lanzhou University, Lanzhou Gansu 730000, People's Republic of China"],"affiliations":[{"raw_affiliation_string":"Department of Mathematics, Lanzhou University, Lanzhou, Gansu 730000, People's Republic of China","institution_ids":["https://openalex.org/I76214153"]},{"raw_affiliation_string":"Department of Mathematics, Lanzhou University, Lanzhou Gansu 730000, People's Republic of China","institution_ids":["https://openalex.org/I76214153"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5064562959","display_name":"Fuji Zhang","orcid":null},"institutions":[{"id":"https://openalex.org/I191208505","display_name":"Xiamen University","ror":"https://ror.org/00mcjh785","country_code":"CN","type":"education","lineage":["https://openalex.org/I191208505"]}],"countries":["CN"],"is_corresponding":false,"raw_author_name":"Fuji Zhang","raw_affiliation_strings":["Department of Mathematics, Xiamen University, Xiamen, Fujian 361005, People's Republic of China","Department of Mathematics Xiamen University Xiamen, Fujian 361005 People's Republic of China"],"affiliations":[{"raw_affiliation_string":"Department of Mathematics, Xiamen University, Xiamen, Fujian 361005, People's Republic of China","institution_ids":["https://openalex.org/I191208505"]},{"raw_affiliation_string":"Department of Mathematics Xiamen University Xiamen, Fujian 361005 People's Republic of China","institution_ids":["https://openalex.org/I191208505"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":2,"corresponding_author_ids":["https://openalex.org/A5056609757"],"corresponding_institution_ids":["https://openalex.org/I76214153"],"apc_list":{"value":2750,"currency":"USD","value_usd":2750},"apc_paid":null,"fwci":0.5094,"has_fulltext":false,"cited_by_count":130,"citation_normalized_percentile":{"value":0.60397056,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":94,"max":100},"biblio":{"volume":"69","issue":"1-2","first_page":"147","last_page":"167"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T11476","display_name":"Graph theory and applications","score":1.0,"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/T11476","display_name":"Graph theory and applications","score":1.0,"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/T11298","display_name":"Synthesis and Properties of Aromatic Compounds","score":0.9991999864578247,"subfield":{"id":"https://openalex.org/subfields/1605","display_name":"Organic Chemistry"},"field":{"id":"https://openalex.org/fields/16","display_name":"Chemistry"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T12748","display_name":"Molecular spectroscopy and chirality","score":0.9718000292778015,"subfield":{"id":"https://openalex.org/subfields/1607","display_name":"Spectroscopy"},"field":{"id":"https://openalex.org/fields/16","display_name":"Chemistry"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/hexagonal-crystal-system","display_name":"Hexagonal crystal system","score":0.8690839409828186},{"id":"https://openalex.org/keywords/mathematics","display_name":"Mathematics","score":0.6581493616104126},{"id":"https://openalex.org/keywords/combinatorics","display_name":"Combinatorics","score":0.6233009696006775},{"id":"https://openalex.org/keywords/polynomial","display_name":"Polynomial","score":0.6048286557197571},{"id":"https://openalex.org/keywords/graph","display_name":"Graph","score":0.5713289380073547},{"id":"https://openalex.org/keywords/crystallography","display_name":"Crystallography","score":0.1288529634475708},{"id":"https://openalex.org/keywords/chemistry","display_name":"Chemistry","score":0.12088948488235474},{"id":"https://openalex.org/keywords/mathematical-analysis","display_name":"Mathematical analysis","score":0.08334892988204956}],"concepts":[{"id":"https://openalex.org/C128765274","wikidata":"https://www.wikidata.org/wiki/Q663314","display_name":"Hexagonal crystal system","level":2,"score":0.8690839409828186},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.6581493616104126},{"id":"https://openalex.org/C114614502","wikidata":"https://www.wikidata.org/wiki/Q76592","display_name":"Combinatorics","level":1,"score":0.6233009696006775},{"id":"https://openalex.org/C90119067","wikidata":"https://www.wikidata.org/wiki/Q43260","display_name":"Polynomial","level":2,"score":0.6048286557197571},{"id":"https://openalex.org/C132525143","wikidata":"https://www.wikidata.org/wiki/Q141488","display_name":"Graph","level":2,"score":0.5713289380073547},{"id":"https://openalex.org/C8010536","wikidata":"https://www.wikidata.org/wiki/Q160398","display_name":"Crystallography","level":1,"score":0.1288529634475708},{"id":"https://openalex.org/C185592680","wikidata":"https://www.wikidata.org/wiki/Q2329","display_name":"Chemistry","level":0,"score":0.12088948488235474},{"id":"https://openalex.org/C134306372","wikidata":"https://www.wikidata.org/wiki/Q7754","display_name":"Mathematical analysis","level":1,"score":0.08334892988204956}],"mesh":[],"locations_count":2,"locations":[{"id":"doi:10.1016/0166-218x(95)00081-2","is_oa":false,"landing_page_url":"https://doi.org/10.1016/0166-218x(95)00081-2","pdf_url":null,"source":{"id":"https://openalex.org/S171741597","display_name":"Discrete Applied Mathematics","issn_l":"0166-218X","issn":["0166-218X","1872-6771"],"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 Applied Mathematics","raw_type":"journal-article"},{"id":"pmh:oai:ir.lzu.edu.cn/:262010/117505","is_oa":true,"landing_page_url":"http://ir.lzu.edu.cn/handle/262010/117505","pdf_url":null,"source":{"id":"https://openalex.org/S4406923049","display_name":"Lanzhou University Institutional Repository","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":"cc-by-nc-nd","license_id":"https://openalex.org/licenses/cc-by-nc-nd","version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"","raw_type":"Article"}],"best_oa_location":{"id":"pmh:oai:ir.lzu.edu.cn/:262010/117505","is_oa":true,"landing_page_url":"http://ir.lzu.edu.cn/handle/262010/117505","pdf_url":null,"source":{"id":"https://openalex.org/S4406923049","display_name":"Lanzhou University Institutional Repository","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":"cc-by-nc-nd","license_id":"https://openalex.org/licenses/cc-by-nc-nd","version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"","raw_type":"Article"},"sustainable_development_goals":[{"display_name":"Affordable and clean energy","score":0.47999998927116394,"id":"https://metadata.un.org/sdg/7"}],"awards":[],"funders":[],"has_content":{"pdf":false,"grobid_xml":false},"content_urls":null,"referenced_works_count":21,"referenced_works":["https://openalex.org/W89062394","https://openalex.org/W566104198","https://openalex.org/W1538603582","https://openalex.org/W1602998205","https://openalex.org/W1964770505","https://openalex.org/W1980950380","https://openalex.org/W1994801650","https://openalex.org/W2007981503","https://openalex.org/W2022625448","https://openalex.org/W2030666699","https://openalex.org/W2031956808","https://openalex.org/W2038287602","https://openalex.org/W2038813459","https://openalex.org/W2083396508","https://openalex.org/W2085061223","https://openalex.org/W2088532416","https://openalex.org/W2091350104","https://openalex.org/W2164857437","https://openalex.org/W2373113715","https://openalex.org/W6615843495","https://openalex.org/W6632208896"],"related_works":["https://openalex.org/W1979597421","https://openalex.org/W2007980826","https://openalex.org/W4245490552","https://openalex.org/W4225152035","https://openalex.org/W2061531152","https://openalex.org/W3002753104","https://openalex.org/W2077600819","https://openalex.org/W1587224694","https://openalex.org/W2911598644","https://openalex.org/W2142036596"],"abstract_inverted_index":null,"counts_by_year":[{"year":2025,"cited_by_count":2},{"year":2024,"cited_by_count":11},{"year":2023,"cited_by_count":7},{"year":2022,"cited_by_count":8},{"year":2021,"cited_by_count":14},{"year":2020,"cited_by_count":16},{"year":2019,"cited_by_count":5},{"year":2018,"cited_by_count":11},{"year":2017,"cited_by_count":10},{"year":2016,"cited_by_count":5},{"year":2015,"cited_by_count":6},{"year":2014,"cited_by_count":7},{"year":2013,"cited_by_count":2},{"year":2012,"cited_by_count":3}],"updated_date":"2026-03-10T14:07:55.174380","created_date":"2025-10-10T00:00:00"}