{"id":"https://openalex.org/W2041670454","doi":"https://doi.org/10.1016/0166-218x(81)90012-3","title":"Concerning the complexity of deciding isomorphism of block designs","display_name":"Concerning the complexity of deciding isomorphism of block designs","publication_year":1981,"publication_date":"1981-07-01","ids":{"openalex":"https://openalex.org/W2041670454","doi":"https://doi.org/10.1016/0166-218x(81)90012-3","mag":"2041670454"},"language":"en","primary_location":{"id":"doi:10.1016/0166-218x(81)90012-3","is_oa":false,"landing_page_url":"https://doi.org/10.1016/0166-218x(81)90012-3","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":false,"oa_status":"closed","oa_url":null,"any_repository_has_fulltext":false},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5109085149","display_name":"Marlene J. Colbourn","orcid":null},"institutions":[{"id":"https://openalex.org/I32625721","display_name":"University of Saskatchewan","ror":"https://ror.org/010x8gc63","country_code":"CA","type":"education","lineage":["https://openalex.org/I32625721"]}],"countries":["CA"],"is_corresponding":true,"raw_author_name":"Marlene J. Colbourn","raw_affiliation_strings":["Department of Computational Science, University of Saskatchewan, Saskatoon, Saskatchewan S7N OWO, Canada","Department of Computational Science, University of Saskatchewan, Saskatoon, Saskatchewan, S7N OWO Canada"],"affiliations":[{"raw_affiliation_string":"Department of Computational Science, University of Saskatchewan, Saskatoon, Saskatchewan S7N OWO, Canada","institution_ids":["https://openalex.org/I32625721"]},{"raw_affiliation_string":"Department of Computational Science, University of Saskatchewan, Saskatoon, Saskatchewan, S7N OWO Canada","institution_ids":["https://openalex.org/I32625721"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5038008468","display_name":"Charles J. Colbourn","orcid":"https://orcid.org/0000-0002-3104-9515"},"institutions":[{"id":"https://openalex.org/I32625721","display_name":"University of Saskatchewan","ror":"https://ror.org/010x8gc63","country_code":"CA","type":"education","lineage":["https://openalex.org/I32625721"]}],"countries":["CA"],"is_corresponding":false,"raw_author_name":"Charles J. Colbourn","raw_affiliation_strings":["Department of Computational Science, University of Saskatchewan, Saskatoon, Saskatchewan S7N OWO, Canada","Department of Computational Science, University of Saskatchewan, Saskatoon, Saskatchewan, S7N OWO Canada"],"affiliations":[{"raw_affiliation_string":"Department of Computational Science, University of Saskatchewan, Saskatoon, Saskatchewan S7N OWO, Canada","institution_ids":["https://openalex.org/I32625721"]},{"raw_affiliation_string":"Department of Computational Science, University of Saskatchewan, Saskatoon, Saskatchewan, S7N OWO Canada","institution_ids":["https://openalex.org/I32625721"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":2,"corresponding_author_ids":["https://openalex.org/A5109085149"],"corresponding_institution_ids":["https://openalex.org/I32625721"],"apc_list":{"value":2750,"currency":"USD","value_usd":2750},"apc_paid":null,"fwci":1.1812,"has_fulltext":false,"cited_by_count":16,"citation_normalized_percentile":{"value":0.78300547,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":90,"max":95},"biblio":{"volume":"3","issue":"3","first_page":"155","last_page":"162"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T11797","display_name":"graph theory and CDMA systems","score":0.9962000250816345,"subfield":{"id":"https://openalex.org/subfields/2208","display_name":"Electrical and Electronic Engineering"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},"topics":[{"id":"https://openalex.org/T11797","display_name":"graph theory and CDMA systems","score":0.9962000250816345,"subfield":{"id":"https://openalex.org/subfields/2208","display_name":"Electrical and Electronic 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/T10374","display_name":"Advanced Graph Theory Research","score":0.9922000169754028,"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/T11522","display_name":"VLSI and FPGA Design Techniques","score":0.9879999756813049,"subfield":{"id":"https://openalex.org/subfields/2208","display_name":"Electrical and Electronic Engineering"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/graph-isomorphism","display_name":"Graph isomorphism","score":0.8876423835754395},{"id":"https://openalex.org/keywords/isomorphism","display_name":"Isomorphism (crystallography)","score":0.826569676399231},{"id":"https://openalex.org/keywords/mathematics","display_name":"Mathematics","score":0.7661417722702026},{"id":"https://openalex.org/keywords/block","display_name":"Block (permutation group theory)","score":0.6576371788978577},{"id":"https://openalex.org/keywords/combinatorics","display_name":"Combinatorics","score":0.5669003129005432},{"id":"https://openalex.org/keywords/graph","display_name":"Graph","score":0.513388991355896},{"id":"https://openalex.org/keywords/graph-automorphism","display_name":"Graph automorphism","score":0.4600706994533539},{"id":"https://openalex.org/keywords/discrete-mathematics","display_name":"Discrete mathematics","score":0.43592122197151184},{"id":"https://openalex.org/keywords/voltage-graph","display_name":"Voltage graph","score":0.15568161010742188},{"id":"https://openalex.org/keywords/line-graph","display_name":"Line graph","score":0.10962626338005066}],"concepts":[{"id":"https://openalex.org/C61665672","wikidata":"https://www.wikidata.org/wiki/Q303100","display_name":"Graph isomorphism","level":4,"score":0.8876423835754395},{"id":"https://openalex.org/C203436722","wikidata":"https://www.wikidata.org/wiki/Q902950","display_name":"Isomorphism (crystallography)","level":3,"score":0.826569676399231},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.7661417722702026},{"id":"https://openalex.org/C2777210771","wikidata":"https://www.wikidata.org/wiki/Q4927124","display_name":"Block (permutation group theory)","level":2,"score":0.6576371788978577},{"id":"https://openalex.org/C114614502","wikidata":"https://www.wikidata.org/wiki/Q76592","display_name":"Combinatorics","level":1,"score":0.5669003129005432},{"id":"https://openalex.org/C132525143","wikidata":"https://www.wikidata.org/wiki/Q141488","display_name":"Graph","level":2,"score":0.513388991355896},{"id":"https://openalex.org/C6049932","wikidata":"https://www.wikidata.org/wiki/Q834981","display_name":"Graph automorphism","level":5,"score":0.4600706994533539},{"id":"https://openalex.org/C118615104","wikidata":"https://www.wikidata.org/wiki/Q121416","display_name":"Discrete mathematics","level":1,"score":0.43592122197151184},{"id":"https://openalex.org/C22149727","wikidata":"https://www.wikidata.org/wiki/Q7940747","display_name":"Voltage graph","level":4,"score":0.15568161010742188},{"id":"https://openalex.org/C203776342","wikidata":"https://www.wikidata.org/wiki/Q1378376","display_name":"Line graph","level":3,"score":0.10962626338005066},{"id":"https://openalex.org/C185592680","wikidata":"https://www.wikidata.org/wiki/Q2329","display_name":"Chemistry","level":0,"score":0.0},{"id":"https://openalex.org/C8010536","wikidata":"https://www.wikidata.org/wiki/Q160398","display_name":"Crystallography","level":1,"score":0.0},{"id":"https://openalex.org/C115624301","wikidata":"https://www.wikidata.org/wiki/Q895901","display_name":"Crystal structure","level":2,"score":0.0}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1016/0166-218x(81)90012-3","is_oa":false,"landing_page_url":"https://doi.org/10.1016/0166-218x(81)90012-3","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"}],"best_oa_location":null,"sustainable_development_goals":[{"id":"https://metadata.un.org/sdg/11","display_name":"Sustainable cities and communities","score":0.5099999904632568}],"awards":[],"funders":[],"has_content":{"pdf":false,"grobid_xml":false},"content_urls":null,"referenced_works_count":16,"referenced_works":["https://openalex.org/W1484040084","https://openalex.org/W1975744772","https://openalex.org/W1989188127","https://openalex.org/W2013054747","https://openalex.org/W2015353395","https://openalex.org/W2023577810","https://openalex.org/W2048172960","https://openalex.org/W2051748083","https://openalex.org/W2063402200","https://openalex.org/W2069903885","https://openalex.org/W2073067110","https://openalex.org/W2073367256","https://openalex.org/W2101451020","https://openalex.org/W4242244429","https://openalex.org/W4300303686","https://openalex.org/W6824024096"],"related_works":["https://openalex.org/W1711180383","https://openalex.org/W1258892498","https://openalex.org/W3047524870","https://openalex.org/W2017265236","https://openalex.org/W1522618089","https://openalex.org/W2175495255","https://openalex.org/W2187958446","https://openalex.org/W2041670454","https://openalex.org/W1982404768","https://openalex.org/W2153879854"],"abstract_inverted_index":null,"counts_by_year":[{"year":2025,"cited_by_count":1},{"year":2018,"cited_by_count":1}],"updated_date":"2026-03-10T14:07:55.174380","created_date":"2025-10-10T00:00:00"}
