{"id":"https://openalex.org/W2053852843","doi":"https://doi.org/10.1002/malq.19760220122","title":"Ein Rekursiv Aufz\u00e4hlbarer btt\u2010Grad, der Nicht Zum Wortproblem Einer Gruppe Geh\u00f6rt","display_name":"Ein Rekursiv Aufz\u00e4hlbarer btt\u2010Grad, der Nicht Zum Wortproblem Einer Gruppe Geh\u00f6rt","publication_year":1976,"publication_date":"1976-01-01","ids":{"openalex":"https://openalex.org/W2053852843","doi":"https://doi.org/10.1002/malq.19760220122","mag":"2053852843"},"language":"de","primary_location":{"id":"doi:10.1002/malq.19760220122","is_oa":false,"landing_page_url":"https://doi.org/10.1002/malq.19760220122","pdf_url":null,"source":{"id":"https://openalex.org/S172351290","display_name":"Mathematical logic quarterly","issn_l":"0044-3050","issn":["0044-3050","0942-5616","1521-3870"],"is_oa":false,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310320595","host_organization_name":"Wiley","host_organization_lineage":["https://openalex.org/P4310320595"],"host_organization_lineage_names":["Wiley"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Mathematical Logic Quarterly","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/A5101546631","display_name":"Martin Ziegler","orcid":"https://orcid.org/0000-0001-6734-7875"},"institutions":[],"countries":[],"is_corresponding":true,"raw_author_name":"Martin Ziegler","raw_affiliation_strings":["West-Berlin","West\u2010Berlin"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"West-Berlin","institution_ids":[]},{"raw_affiliation_string":"West\u2010Berlin","institution_ids":[]}]}],"institutions":[],"countries_distinct_count":0,"institutions_distinct_count":0,"corresponding_author_ids":["https://openalex.org/A5101546631"],"corresponding_institution_ids":[],"apc_list":{"value":2900,"currency":"USD","value_usd":2900},"apc_paid":null,"fwci":8.1842,"has_fulltext":false,"cited_by_count":9,"citation_normalized_percentile":{"value":0.96798933,"is_in_top_1_percent":false,"is_in_top_10_percent":true},"cited_by_percentile_year":{"min":90,"max":95},"biblio":{"volume":"22","issue":"1","first_page":"165","last_page":"168"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T12373","display_name":"Linguistic research and analysis","score":0.4505999982357025,"subfield":{"id":"https://openalex.org/subfields/1203","display_name":"Language and Linguistics"},"field":{"id":"https://openalex.org/fields/12","display_name":"Arts and Humanities"},"domain":{"id":"https://openalex.org/domains/2","display_name":"Social Sciences"}},"topics":[{"id":"https://openalex.org/T12373","display_name":"Linguistic research and analysis","score":0.4505999982357025,"subfield":{"id":"https://openalex.org/subfields/1203","display_name":"Language and Linguistics"},"field":{"id":"https://openalex.org/fields/12","display_name":"Arts and Humanities"},"domain":{"id":"https://openalex.org/domains/2","display_name":"Social Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/citation","display_name":"Citation","score":0.4825798571109772},{"id":"https://openalex.org/keywords/mathematics","display_name":"Mathematics","score":0.35910820960998535},{"id":"https://openalex.org/keywords/library-science","display_name":"Library science","score":0.3539145588874817},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.3194986581802368}],"concepts":[{"id":"https://openalex.org/C2778805511","wikidata":"https://www.wikidata.org/wiki/Q1713","display_name":"Citation","level":2,"score":0.4825798571109772},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.35910820960998535},{"id":"https://openalex.org/C161191863","wikidata":"https://www.wikidata.org/wiki/Q199655","display_name":"Library science","level":1,"score":0.3539145588874817},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.3194986581802368}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1002/malq.19760220122","is_oa":false,"landing_page_url":"https://doi.org/10.1002/malq.19760220122","pdf_url":null,"source":{"id":"https://openalex.org/S172351290","display_name":"Mathematical logic quarterly","issn_l":"0044-3050","issn":["0044-3050","0942-5616","1521-3870"],"is_oa":false,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310320595","host_organization_name":"Wiley","host_organization_lineage":["https://openalex.org/P4310320595"],"host_organization_lineage_names":["Wiley"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Mathematical Logic Quarterly","raw_type":"journal-article"}],"best_oa_location":null,"sustainable_development_goals":[{"score":0.41999998688697815,"id":"https://metadata.un.org/sdg/10","display_name":"Reduced inequalities"}],"awards":[],"funders":[],"has_content":{"grobid_xml":false,"pdf":false},"content_urls":null,"referenced_works_count":7,"referenced_works":["https://openalex.org/W1529081828","https://openalex.org/W2003323474","https://openalex.org/W2013266582","https://openalex.org/W2048519990","https://openalex.org/W2319243709","https://openalex.org/W2331518422","https://openalex.org/W2331615350"],"related_works":["https://openalex.org/W2748952813","https://openalex.org/W1979597421","https://openalex.org/W2007980826","https://openalex.org/W4245490552","https://openalex.org/W4225152035","https://openalex.org/W2061531152","https://openalex.org/W3002753104","https://openalex.org/W2077600819","https://openalex.org/W1587224694","https://openalex.org/W2911598644"],"abstract_inverted_index":null,"counts_by_year":[{"year":2025,"cited_by_count":1},{"year":2016,"cited_by_count":1}],"updated_date":"2026-08-21T09:56:20.448147","created_date":"2025-10-10T00:00:00"}