{"id":"https://openalex.org/W1993499670","doi":"https://doi.org/10.1016/s0019-9958(74)80038-0","title":"Non-context-free grammars generating context-free languages","display_name":"Non-context-free grammars generating context-free languages","publication_year":1974,"publication_date":"1974-03-01","ids":{"openalex":"https://openalex.org/W1993499670","doi":"https://doi.org/10.1016/s0019-9958(74)80038-0","mag":"1993499670"},"language":"en","primary_location":{"id":"doi:10.1016/s0019-9958(74)80038-0","is_oa":false,"landing_page_url":"https://doi.org/10.1016/s0019-9958(74)80038-0","pdf_url":null,"source":{"id":"https://openalex.org/S4210192454","display_name":"Information and Control","issn_l":"0019-9958","issn":["0019-9958","1878-2981"],"is_oa":false,"is_in_doaj":false,"is_core":false,"host_organization":"https://openalex.org/P4310319955","host_organization_name":"Academic Press","host_organization_lineage":["https://openalex.org/P4310319955","https://openalex.org/P4310320990"],"host_organization_lineage_names":["Academic Press","Elsevier BV"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Information and Control","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/A5108392571","display_name":"Brenda S. Baker","orcid":null},"institutions":[{"id":"https://openalex.org/I136199984","display_name":"Harvard University","ror":"https://ror.org/03vek6s52","country_code":"US","type":"education","lineage":["https://openalex.org/I136199984"]}],"countries":["US"],"is_corresponding":true,"raw_author_name":"Brenda S. Baker","raw_affiliation_strings":["Center for Research in Computing Technology, Harvard University, Cambridge, Massachusetts 02138, USA"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Center for Research in Computing Technology, Harvard University, Cambridge, Massachusetts 02138, USA","institution_ids":["https://openalex.org/I136199984"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":1,"corresponding_author_ids":["https://openalex.org/A5108392571"],"corresponding_institution_ids":["https://openalex.org/I136199984"],"apc_list":null,"apc_paid":null,"fwci":1.7708,"has_fulltext":false,"cited_by_count":22,"citation_normalized_percentile":{"value":0.83573755,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":89,"max":96},"biblio":{"volume":"24","issue":"3","first_page":"231","last_page":"246"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T11567","display_name":"semigroups and automata theory","score":0.9997000098228455,"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":0.9997000098228455,"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":0.9984999895095825,"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/T11269","display_name":"Algorithms and Data Compression","score":0.9919999837875366,"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"}}],"keywords":[{"id":"https://openalex.org/keywords/tree-adjoining-grammar","display_name":"Tree-adjoining grammar","score":0.71746426820755},{"id":"https://openalex.org/keywords/context-free-grammar","display_name":"Context-free grammar","score":0.7171887159347534},{"id":"https://openalex.org/keywords/context-sensitive-grammar","display_name":"Context-sensitive grammar","score":0.696225643157959},{"id":"https://openalex.org/keywords/extended-affix-grammar","display_name":"Extended Affix Grammar","score":0.6564701199531555},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.6461778879165649},{"id":"https://openalex.org/keywords/rule-based-machine-translation","display_name":"Rule-based machine translation","score":0.6365437507629395},{"id":"https://openalex.org/keywords/l-attributed-grammar","display_name":"L-attributed grammar","score":0.5563254356384277},{"id":"https://openalex.org/keywords/context","display_name":"Context (archaeology)","score":0.5487537980079651},{"id":"https://openalex.org/keywords/programming-language","display_name":"Programming language","score":0.5301436185836792},{"id":"https://openalex.org/keywords/indexed-grammar","display_name":"Indexed grammar","score":0.45465564727783203},{"id":"https://openalex.org/keywords/stochastic-context-free-grammar","display_name":"Stochastic context-free grammar","score":0.4525909721851349},{"id":"https://openalex.org/keywords/phrase-structure-grammar","display_name":"Phrase structure grammar","score":0.42316120862960815},{"id":"https://openalex.org/keywords/embedded-pushdown-automaton","display_name":"Embedded pushdown automaton","score":0.4190625548362732},{"id":"https://openalex.org/keywords/natural-language-processing","display_name":"Natural language processing","score":0.41609835624694824},{"id":"https://openalex.org/keywords/history","display_name":"History","score":0.05569279193878174}],"concepts":[{"id":"https://openalex.org/C134083981","wikidata":"https://www.wikidata.org/wiki/Q1754022","display_name":"Tree-adjoining grammar","level":4,"score":0.71746426820755},{"id":"https://openalex.org/C97212296","wikidata":"https://www.wikidata.org/wiki/Q338047","display_name":"Context-free grammar","level":3,"score":0.7171887159347534},{"id":"https://openalex.org/C125950753","wikidata":"https://www.wikidata.org/wiki/Q908674","display_name":"Context-sensitive grammar","level":4,"score":0.696225643157959},{"id":"https://openalex.org/C37734731","wikidata":"https://www.wikidata.org/wiki/Q5421802","display_name":"Extended Affix Grammar","level":4,"score":0.6564701199531555},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.6461778879165649},{"id":"https://openalex.org/C53893814","wikidata":"https://www.wikidata.org/wiki/Q7378909","display_name":"Rule-based machine translation","level":2,"score":0.6365437507629395},{"id":"https://openalex.org/C67621940","wikidata":"https://www.wikidata.org/wiki/Q3113340","display_name":"L-attributed grammar","level":4,"score":0.5563254356384277},{"id":"https://openalex.org/C2779343474","wikidata":"https://www.wikidata.org/wiki/Q3109175","display_name":"Context (archaeology)","level":2,"score":0.5487537980079651},{"id":"https://openalex.org/C199360897","wikidata":"https://www.wikidata.org/wiki/Q9143","display_name":"Programming language","level":1,"score":0.5301436185836792},{"id":"https://openalex.org/C79243999","wikidata":"https://www.wikidata.org/wiki/Q6590011","display_name":"Indexed grammar","level":5,"score":0.45465564727783203},{"id":"https://openalex.org/C199624470","wikidata":"https://www.wikidata.org/wiki/Q2377216","display_name":"Stochastic context-free grammar","level":5,"score":0.4525909721851349},{"id":"https://openalex.org/C29184939","wikidata":"https://www.wikidata.org/wiki/Q1134367","display_name":"Phrase structure grammar","level":4,"score":0.42316120862960815},{"id":"https://openalex.org/C27034413","wikidata":"https://www.wikidata.org/wiki/Q5370010","display_name":"Embedded pushdown automaton","level":5,"score":0.4190625548362732},{"id":"https://openalex.org/C204321447","wikidata":"https://www.wikidata.org/wiki/Q30642","display_name":"Natural language processing","level":1,"score":0.41609835624694824},{"id":"https://openalex.org/C95457728","wikidata":"https://www.wikidata.org/wiki/Q309","display_name":"History","level":0,"score":0.05569279193878174},{"id":"https://openalex.org/C166957645","wikidata":"https://www.wikidata.org/wiki/Q23498","display_name":"Archaeology","level":1,"score":0.0}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1016/s0019-9958(74)80038-0","is_oa":false,"landing_page_url":"https://doi.org/10.1016/s0019-9958(74)80038-0","pdf_url":null,"source":{"id":"https://openalex.org/S4210192454","display_name":"Information and Control","issn_l":"0019-9958","issn":["0019-9958","1878-2981"],"is_oa":false,"is_in_doaj":false,"is_core":false,"host_organization":"https://openalex.org/P4310319955","host_organization_name":"Academic Press","host_organization_lineage":["https://openalex.org/P4310319955","https://openalex.org/P4310320990"],"host_organization_lineage_names":["Academic Press","Elsevier BV"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Information and Control","raw_type":"journal-article"}],"best_oa_location":null,"sustainable_development_goals":[],"awards":[],"funders":[],"has_content":{"grobid_xml":false,"pdf":false},"content_urls":null,"referenced_works_count":7,"referenced_works":["https://openalex.org/W299519334","https://openalex.org/W1964596896","https://openalex.org/W1976036486","https://openalex.org/W1985853541","https://openalex.org/W2072134876","https://openalex.org/W2073763412","https://openalex.org/W2148224873"],"related_works":["https://openalex.org/W2918124307","https://openalex.org/W1608157979","https://openalex.org/W1980918784","https://openalex.org/W2403874525","https://openalex.org/W59084530","https://openalex.org/W2153803459","https://openalex.org/W2012632856","https://openalex.org/W2070208002","https://openalex.org/W1963896666","https://openalex.org/W2087446293"],"abstract_inverted_index":null,"counts_by_year":[{"year":2024,"cited_by_count":1},{"year":2023,"cited_by_count":1},{"year":2019,"cited_by_count":1},{"year":2015,"cited_by_count":1},{"year":2014,"cited_by_count":1},{"year":2013,"cited_by_count":1},{"year":2012,"cited_by_count":2}],"updated_date":"2025-11-06T03:46:38.306776","created_date":"2025-10-10T00:00:00"}
