{"id":"https://openalex.org/W2032703122","doi":"https://doi.org/10.1007/bf00264567","title":"Substitution of grammar forms","display_name":"Substitution of grammar forms","publication_year":1975,"publication_date":"1975-01-01","ids":{"openalex":"https://openalex.org/W2032703122","doi":"https://doi.org/10.1007/bf00264567","mag":"2032703122"},"language":"en","primary_location":{"id":"doi:10.1007/bf00264567","is_oa":false,"landing_page_url":"https://doi.org/10.1007/bf00264567","pdf_url":null,"source":{"id":"https://openalex.org/S84409463","display_name":"Acta Informatica","issn_l":"0001-5903","issn":["0001-5903","1432-0525"],"is_oa":false,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310319900","host_organization_name":"Springer Science+Business Media","host_organization_lineage":["https://openalex.org/P4310319900","https://openalex.org/P4310319965"],"host_organization_lineage_names":["Springer Science+Business Media","Springer Nature"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Acta Informatica","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/A5109880465","display_name":"Seymour Ginsburg","orcid":null},"institutions":[{"id":"https://openalex.org/I1174212","display_name":"University of Southern California","ror":"https://ror.org/03taz7m60","country_code":"US","type":"education","lineage":["https://openalex.org/I1174212"]}],"countries":["US"],"is_corresponding":true,"raw_author_name":"Seymour Ginsburg","raw_affiliation_strings":["Computer Science Program, University of Southern California, 90007, University Park Los Angeles, Calif., USA","Computer Science Program, University of Southern California, University Park Los Angeles, USA 90007#TAB#"],"affiliations":[{"raw_affiliation_string":"Computer Science Program, University of Southern California, 90007, University Park Los Angeles, Calif., USA","institution_ids":["https://openalex.org/I1174212"]},{"raw_affiliation_string":"Computer Science Program, University of Southern California, University Park Los Angeles, USA 90007#TAB#","institution_ids":["https://openalex.org/I1174212"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5110060246","display_name":"EdwinH. Spanier","orcid":null},"institutions":[{"id":"https://openalex.org/I95457486","display_name":"University of California, Berkeley","ror":"https://ror.org/01an7q238","country_code":"US","type":"education","lineage":["https://openalex.org/I95457486"]}],"countries":["US"],"is_corresponding":false,"raw_author_name":"EdwinH. Spanier","raw_affiliation_strings":["Department of Mathematics, University of California at Berkeley, 94720, Berkeley, Calif., USA","Department of Mathematics, University of California at Berkeley, Berkeley, USA 94720#TAB#"],"affiliations":[{"raw_affiliation_string":"Department of Mathematics, University of California at Berkeley, 94720, Berkeley, Calif., USA","institution_ids":["https://openalex.org/I95457486"]},{"raw_affiliation_string":"Department of Mathematics, University of California at Berkeley, Berkeley, USA 94720#TAB#","institution_ids":["https://openalex.org/I95457486"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":2,"corresponding_author_ids":["https://openalex.org/A5109880465"],"corresponding_institution_ids":["https://openalex.org/I1174212"],"apc_list":{"value":2390,"currency":"EUR","value_usd":2990},"apc_paid":null,"fwci":2.7528,"has_fulltext":false,"cited_by_count":6,"citation_normalized_percentile":{"value":0.91804424,"is_in_top_1_percent":false,"is_in_top_10_percent":true},"cited_by_percentile_year":null,"biblio":{"volume":"5","issue":"4","first_page":null,"last_page":null},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T11567","display_name":"semigroups and automata theory","score":0.9994999766349792,"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":0.9994999766349792,"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":0.992900013923645,"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/T10911","display_name":"Chemical Synthesis and Analysis","score":0.9768999814987183,"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/substitution","display_name":"Substitution (logic)","score":0.7536793351173401},{"id":"https://openalex.org/keywords/grammar","display_name":"Grammar","score":0.7464601993560791},{"id":"https://openalex.org/keywords/mathematics","display_name":"Mathematics","score":0.5766844749450684},{"id":"https://openalex.org/keywords/combinatorics","display_name":"Combinatorics","score":0.515442967414856},{"id":"https://openalex.org/keywords/linguistics","display_name":"Linguistics","score":0.42454689741134644},{"id":"https://openalex.org/keywords/language-family","display_name":"Language family","score":0.4169148802757263},{"id":"https://openalex.org/keywords/discrete-mathematics","display_name":"Discrete mathematics","score":0.32114410400390625},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.3208080232143402},{"id":"https://openalex.org/keywords/philosophy","display_name":"Philosophy","score":0.11397391557693481}],"concepts":[{"id":"https://openalex.org/C2778220771","wikidata":"https://www.wikidata.org/wiki/Q1522579","display_name":"Substitution (logic)","level":2,"score":0.7536793351173401},{"id":"https://openalex.org/C26022165","wikidata":"https://www.wikidata.org/wiki/Q8091","display_name":"Grammar","level":2,"score":0.7464601993560791},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.5766844749450684},{"id":"https://openalex.org/C114614502","wikidata":"https://www.wikidata.org/wiki/Q76592","display_name":"Combinatorics","level":1,"score":0.515442967414856},{"id":"https://openalex.org/C41895202","wikidata":"https://www.wikidata.org/wiki/Q8162","display_name":"Linguistics","level":1,"score":0.42454689741134644},{"id":"https://openalex.org/C2780566098","wikidata":"https://www.wikidata.org/wiki/Q25295","display_name":"Language family","level":2,"score":0.4169148802757263},{"id":"https://openalex.org/C118615104","wikidata":"https://www.wikidata.org/wiki/Q121416","display_name":"Discrete mathematics","level":1,"score":0.32114410400390625},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.3208080232143402},{"id":"https://openalex.org/C138885662","wikidata":"https://www.wikidata.org/wiki/Q5891","display_name":"Philosophy","level":0,"score":0.11397391557693481}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1007/bf00264567","is_oa":false,"landing_page_url":"https://doi.org/10.1007/bf00264567","pdf_url":null,"source":{"id":"https://openalex.org/S84409463","display_name":"Acta Informatica","issn_l":"0001-5903","issn":["0001-5903","1432-0525"],"is_oa":false,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310319900","host_organization_name":"Springer Science+Business Media","host_organization_lineage":["https://openalex.org/P4310319900","https://openalex.org/P4310319965"],"host_organization_lineage_names":["Springer Science+Business Media","Springer Nature"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Acta Informatica","raw_type":"journal-article"}],"best_oa_location":null,"sustainable_development_goals":[{"score":0.4699999988079071,"display_name":"Quality Education","id":"https://metadata.un.org/sdg/4"}],"awards":[],"funders":[],"has_content":{"pdf":false,"grobid_xml":false},"content_urls":null,"referenced_works_count":6,"referenced_works":["https://openalex.org/W2001447498","https://openalex.org/W2016206602","https://openalex.org/W2049692841","https://openalex.org/W2062920098","https://openalex.org/W2065579926","https://openalex.org/W2073779224"],"related_works":["https://openalex.org/W2379444625","https://openalex.org/W2393147081","https://openalex.org/W2575869988","https://openalex.org/W4308647020","https://openalex.org/W2370088286","https://openalex.org/W2385568494","https://openalex.org/W2038132579","https://openalex.org/W2042068218","https://openalex.org/W4327590948","https://openalex.org/W2950568348"],"abstract_inverted_index":null,"counts_by_year":[],"updated_date":"2025-11-06T03:46:38.306776","created_date":"2025-10-10T00:00:00"}