{"id":"https://openalex.org/W2071958862","doi":"https://doi.org/10.1016/s0022-0000(05)80086-8","title":"The complexity of connectivity problems on context-free graph languages","display_name":"The complexity of connectivity problems on context-free graph languages","publication_year":1994,"publication_date":"1994-08-01","ids":{"openalex":"https://openalex.org/W2071958862","doi":"https://doi.org/10.1016/s0022-0000(05)80086-8","mag":"2071958862"},"language":"en","primary_location":{"id":"doi:10.1016/s0022-0000(05)80086-8","is_oa":false,"landing_page_url":"https://doi.org/10.1016/s0022-0000(05)80086-8","pdf_url":null,"source":{"id":"https://openalex.org/S141020589","display_name":"Journal of Computer and System Sciences","issn_l":"0022-0000","issn":["0022-0000","1090-2724"],"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":"Journal of Computer and System Sciences","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/A5069174754","display_name":"Egon Wanke","orcid":null},"institutions":[{"id":"https://openalex.org/I206945453","display_name":"Paderborn University","ror":"https://ror.org/058kzsd48","country_code":"DE","type":"education","lineage":["https://openalex.org/I206945453"]},{"id":"https://openalex.org/I4210098248","display_name":"Fraunhofer Institute for Algorithms and Scientific Computing","ror":"https://ror.org/00trw9c49","country_code":"DE","type":"facility","lineage":["https://openalex.org/I4210098248","https://openalex.org/I4923324"]}],"countries":["DE"],"is_corresponding":true,"raw_author_name":"Egon Wanke","raw_affiliation_strings":["Institute of Methodical Foundations\u2014Discrete Algorithms, German National Research Center for Computer Science (GMO), D-53757 Sankt Augustin, Germany","Mathematik/Informatik, Universit\u00e4t-Gesamthochschule Paderborn, Paderborn, West Germany"],"affiliations":[{"raw_affiliation_string":"Institute of Methodical Foundations\u2014Discrete Algorithms, German National Research Center for Computer Science (GMO), D-53757 Sankt Augustin, Germany","institution_ids":["https://openalex.org/I4210098248"]},{"raw_affiliation_string":"Mathematik/Informatik, Universit\u00e4t-Gesamthochschule Paderborn, Paderborn, West Germany","institution_ids":["https://openalex.org/I206945453"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":1,"corresponding_author_ids":["https://openalex.org/A5069174754"],"corresponding_institution_ids":["https://openalex.org/I206945453","https://openalex.org/I4210098248"],"apc_list":{"value":2520,"currency":"USD","value_usd":2520},"apc_paid":null,"fwci":0.0,"has_fulltext":false,"cited_by_count":6,"citation_normalized_percentile":{"value":0.19889387,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":89,"max":94},"biblio":{"volume":"49","issue":"1","first_page":"57","last_page":"82"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T11567","display_name":"semigroups and automata theory","score":0.9979000091552734,"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/T11567","display_name":"semigroups and automata theory","score":0.9979000091552734,"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/T12029","display_name":"DNA and Biological Computing","score":0.9976999759674072,"subfield":{"id":"https://openalex.org/subfields/1312","display_name":"Molecular Biology"},"field":{"id":"https://openalex.org/fields/13","display_name":"Biochemistry, Genetics and Molecular Biology"},"domain":{"id":"https://openalex.org/domains/1","display_name":"Life Sciences"}},{"id":"https://openalex.org/T10142","display_name":"Formal Methods in Verification","score":0.9950000047683716,"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/discrete-mathematics","display_name":"Discrete mathematics","score":0.5900686383247375},{"id":"https://openalex.org/keywords/combinatorics","display_name":"Combinatorics","score":0.5588012933731079},{"id":"https://openalex.org/keywords/mathematics","display_name":"Mathematics","score":0.5229129195213318},{"id":"https://openalex.org/keywords/null-graph","display_name":"Null graph","score":0.5155958533287048},{"id":"https://openalex.org/keywords/graph-rewriting","display_name":"Graph rewriting","score":0.4299096465110779},{"id":"https://openalex.org/keywords/rewriting","display_name":"Rewriting","score":0.41855743527412415},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.4154089689254761},{"id":"https://openalex.org/keywords/voltage-graph","display_name":"Voltage graph","score":0.3973059356212616},{"id":"https://openalex.org/keywords/theoretical-computer-science","display_name":"Theoretical computer science","score":0.39394068717956543},{"id":"https://openalex.org/keywords/line-graph","display_name":"Line graph","score":0.39146047830581665},{"id":"https://openalex.org/keywords/graph","display_name":"Graph","score":0.3902779221534729},{"id":"https://openalex.org/keywords/programming-language","display_name":"Programming language","score":0.09076899290084839}],"concepts":[{"id":"https://openalex.org/C118615104","wikidata":"https://www.wikidata.org/wiki/Q121416","display_name":"Discrete mathematics","level":1,"score":0.5900686383247375},{"id":"https://openalex.org/C114614502","wikidata":"https://www.wikidata.org/wiki/Q76592","display_name":"Combinatorics","level":1,"score":0.5588012933731079},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.5229129195213318},{"id":"https://openalex.org/C17169500","wikidata":"https://www.wikidata.org/wiki/Q3033506","display_name":"Null graph","level":5,"score":0.5155958533287048},{"id":"https://openalex.org/C558772884","wikidata":"https://www.wikidata.org/wiki/Q1508564","display_name":"Graph rewriting","level":3,"score":0.4299096465110779},{"id":"https://openalex.org/C154690210","wikidata":"https://www.wikidata.org/wiki/Q1668499","display_name":"Rewriting","level":2,"score":0.41855743527412415},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.4154089689254761},{"id":"https://openalex.org/C22149727","wikidata":"https://www.wikidata.org/wiki/Q7940747","display_name":"Voltage graph","level":4,"score":0.3973059356212616},{"id":"https://openalex.org/C80444323","wikidata":"https://www.wikidata.org/wiki/Q2878974","display_name":"Theoretical computer science","level":1,"score":0.39394068717956543},{"id":"https://openalex.org/C203776342","wikidata":"https://www.wikidata.org/wiki/Q1378376","display_name":"Line graph","level":3,"score":0.39146047830581665},{"id":"https://openalex.org/C132525143","wikidata":"https://www.wikidata.org/wiki/Q141488","display_name":"Graph","level":2,"score":0.3902779221534729},{"id":"https://openalex.org/C199360897","wikidata":"https://www.wikidata.org/wiki/Q9143","display_name":"Programming language","level":1,"score":0.09076899290084839}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1016/s0022-0000(05)80086-8","is_oa":false,"landing_page_url":"https://doi.org/10.1016/s0022-0000(05)80086-8","pdf_url":null,"source":{"id":"https://openalex.org/S141020589","display_name":"Journal of Computer and System Sciences","issn_l":"0022-0000","issn":["0022-0000","1090-2724"],"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":"Journal of Computer and System Sciences","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":29,"referenced_works":["https://openalex.org/W321092300","https://openalex.org/W1510854324","https://openalex.org/W1512428151","https://openalex.org/W1576087595","https://openalex.org/W1600820878","https://openalex.org/W1606179329","https://openalex.org/W1968017594","https://openalex.org/W1969088538","https://openalex.org/W1976710646","https://openalex.org/W1982129592","https://openalex.org/W1992040352","https://openalex.org/W2002048494","https://openalex.org/W2002089154","https://openalex.org/W2006513683","https://openalex.org/W2011039300","https://openalex.org/W2013295728","https://openalex.org/W2016113382","https://openalex.org/W2021380921","https://openalex.org/W2022486658","https://openalex.org/W2023277231","https://openalex.org/W2028357390","https://openalex.org/W2061817376","https://openalex.org/W2068755149","https://openalex.org/W2080485683","https://openalex.org/W4302339081","https://openalex.org/W6611101953","https://openalex.org/W6630549541","https://openalex.org/W6642410053","https://openalex.org/W6979828652"],"related_works":["https://openalex.org/W1482385629","https://openalex.org/W2954009223","https://openalex.org/W2403845778","https://openalex.org/W1568744482","https://openalex.org/W1846899382","https://openalex.org/W1522194571","https://openalex.org/W4379539820","https://openalex.org/W2366079443","https://openalex.org/W1927597435","https://openalex.org/W2793949464"],"abstract_inverted_index":null,"counts_by_year":[{"year":2023,"cited_by_count":1}],"updated_date":"2026-03-10T14:07:55.174380","created_date":"2025-10-10T00:00:00"}