{"id":"https://openalex.org/W2035144987","doi":"https://doi.org/10.1016/0304-3975(85)90096-9","title":"Adding global forbidding context to context-free grammars","display_name":"Adding global forbidding context to context-free grammars","publication_year":1985,"publication_date":"1985-01-01","ids":{"openalex":"https://openalex.org/W2035144987","doi":"https://doi.org/10.1016/0304-3975(85)90096-9","mag":"2035144987"},"language":"en","primary_location":{"id":"doi:10.1016/0304-3975(85)90096-9","is_oa":false,"landing_page_url":"https://doi.org/10.1016/0304-3975(85)90096-9","pdf_url":null,"source":{"id":"https://openalex.org/S90727058","display_name":"Theoretical Computer Science","issn_l":"0304-3975","issn":["0304-3975","1879-2294"],"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":"Theoretical Computer Science","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/A5111820234","display_name":"A. 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, Boulder, CO 80309, U.S.A"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Department of Computer Science, University of Colorado, Boulder, CO 80309, U.S.A","institution_ids":["https://openalex.org/I188538660"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5004268930","display_name":"H. C. M. Kleijn","orcid":null},"institutions":[],"countries":[],"is_corresponding":false,"raw_author_name":"H.C.M. Kleijn","raw_affiliation_strings":["Institute of Applied Mathematics and Computer Science, University of Leiden, 2300 Ra Leiden, The Netherlands"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Institute of Applied Mathematics and Computer Science, University of Leiden, 2300 Ra Leiden, The Netherlands","institution_ids":[]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5110486000","display_name":"Grzegorz Rozenberg","orcid":null},"institutions":[],"countries":[],"is_corresponding":false,"raw_author_name":"G. Rozenberg","raw_affiliation_strings":["Institute of Applied Mathematics and Computer Science, University of Leiden, 2300 Ra Leiden, The Netherlands"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Institute of Applied Mathematics and Computer Science, University of Leiden, 2300 Ra Leiden, The Netherlands","institution_ids":[]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":1,"corresponding_author_ids":[],"corresponding_institution_ids":[],"apc_list":{"value":2600,"currency":"USD","value_usd":2600},"apc_paid":null,"fwci":0.5192,"has_fulltext":false,"cited_by_count":8,"citation_normalized_percentile":{"value":0.63211301,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":89,"max":96},"biblio":{"volume":"37","issue":null,"first_page":"337","last_page":"360"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T11567","display_name":"semigroups and automata theory","score":0.9975000023841858,"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":0.9975000023841858,"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/T10181","display_name":"Natural Language Processing Techniques","score":0.9968000054359436,"subfield":{"id":"https://openalex.org/subfields/1702","display_name":"Artificial Intelligence"},"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":0.991599977016449,"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"}}],"keywords":[{"id":"https://openalex.org/keywords/context","display_name":"Context (archaeology)","score":0.6795334815979004},{"id":"https://openalex.org/keywords/rule-based-machine-translation","display_name":"Rule-based machine translation","score":0.6442301273345947},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.5383917093276978},{"id":"https://openalex.org/keywords/context-free-grammar","display_name":"Context-free grammar","score":0.46363064646720886},{"id":"https://openalex.org/keywords/context-sensitive-grammar","display_name":"Context-sensitive grammar","score":0.4375922977924347},{"id":"https://openalex.org/keywords/programming-language","display_name":"Programming language","score":0.40122079849243164},{"id":"https://openalex.org/keywords/artificial-intelligence","display_name":"Artificial intelligence","score":0.2864021062850952},{"id":"https://openalex.org/keywords/biology","display_name":"Biology","score":0.0949101448059082}],"concepts":[{"id":"https://openalex.org/C2779343474","wikidata":"https://www.wikidata.org/wiki/Q3109175","display_name":"Context (archaeology)","level":2,"score":0.6795334815979004},{"id":"https://openalex.org/C53893814","wikidata":"https://www.wikidata.org/wiki/Q7378909","display_name":"Rule-based machine translation","level":2,"score":0.6442301273345947},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.5383917093276978},{"id":"https://openalex.org/C97212296","wikidata":"https://www.wikidata.org/wiki/Q338047","display_name":"Context-free grammar","level":3,"score":0.46363064646720886},{"id":"https://openalex.org/C125950753","wikidata":"https://www.wikidata.org/wiki/Q908674","display_name":"Context-sensitive grammar","level":4,"score":0.4375922977924347},{"id":"https://openalex.org/C199360897","wikidata":"https://www.wikidata.org/wiki/Q9143","display_name":"Programming language","level":1,"score":0.40122079849243164},{"id":"https://openalex.org/C154945302","wikidata":"https://www.wikidata.org/wiki/Q11660","display_name":"Artificial intelligence","level":1,"score":0.2864021062850952},{"id":"https://openalex.org/C86803240","wikidata":"https://www.wikidata.org/wiki/Q420","display_name":"Biology","level":0,"score":0.0949101448059082},{"id":"https://openalex.org/C151730666","wikidata":"https://www.wikidata.org/wiki/Q7205","display_name":"Paleontology","level":1,"score":0.0}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1016/0304-3975(85)90096-9","is_oa":false,"landing_page_url":"https://doi.org/10.1016/0304-3975(85)90096-9","pdf_url":null,"source":{"id":"https://openalex.org/S90727058","display_name":"Theoretical Computer Science","issn_l":"0304-3975","issn":["0304-3975","1879-2294"],"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":"Theoretical Computer Science","raw_type":"journal-article"}],"best_oa_location":null,"sustainable_development_goals":[{"display_name":"Quality Education","score":0.7400000095367432,"id":"https://metadata.un.org/sdg/4"}],"awards":[],"funders":[],"has_content":{"pdf":false,"grobid_xml":false},"content_urls":null,"referenced_works_count":15,"referenced_works":["https://openalex.org/W30902494","https://openalex.org/W150339765","https://openalex.org/W265920871","https://openalex.org/W1979877014","https://openalex.org/W2001112054","https://openalex.org/W2014816758","https://openalex.org/W2015947405","https://openalex.org/W2030463854","https://openalex.org/W2039162477","https://openalex.org/W2055334547","https://openalex.org/W2400480495","https://openalex.org/W2914032487","https://openalex.org/W4211199110","https://openalex.org/W4213088420","https://openalex.org/W4244740172"],"related_works":["https://openalex.org/W3147354785","https://openalex.org/W2336577598","https://openalex.org/W1997090502","https://openalex.org/W2141137168","https://openalex.org/W4229721093","https://openalex.org/W2095246953","https://openalex.org/W131152816","https://openalex.org/W3038076697","https://openalex.org/W2085190866","https://openalex.org/W2911319454"],"abstract_inverted_index":null,"counts_by_year":[{"year":2017,"cited_by_count":1},{"year":2014,"cited_by_count":1},{"year":2012,"cited_by_count":2}],"updated_date":"2026-07-23T08:03:31.855105","created_date":"2025-10-10T00:00:00"}
