{"id":"https://openalex.org/W1981855662","doi":"https://doi.org/10.1016/0304-3975(90)90163-c","title":"Factorizations of free monoids and unavoidable regularities","display_name":"Factorizations of free monoids and unavoidable regularities","publication_year":1990,"publication_date":"1990-06-01","ids":{"openalex":"https://openalex.org/W1981855662","doi":"https://doi.org/10.1016/0304-3975(90)90163-c","mag":"1981855662"},"language":"en","primary_location":{"id":"doi:10.1016/0304-3975(90)90163-c","is_oa":false,"landing_page_url":"https://doi.org/10.1016/0304-3975(90)90163-c","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/A5111625361","display_name":"Stefano Varricchio","orcid":"https://orcid.org/0009-0009-9297-0656"},"institutions":[{"id":"https://openalex.org/I861853513","display_name":"Sapienza University of Rome","ror":"https://ror.org/02be6w209","country_code":"IT","type":"education","lineage":["https://openalex.org/I861853513"]}],"countries":["IT"],"is_corresponding":true,"raw_author_name":"Stefano Varricchio","raw_affiliation_strings":["Department of Mathematics, University of Rome \u201cLa Sapienza\u201d, Italy"],"affiliations":[{"raw_affiliation_string":"Department of Mathematics, University of Rome \u201cLa Sapienza\u201d, Italy","institution_ids":["https://openalex.org/I861853513"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":1,"corresponding_author_ids":["https://openalex.org/A5111625361"],"corresponding_institution_ids":["https://openalex.org/I861853513"],"apc_list":{"value":2690,"currency":"USD","value_usd":2690},"apc_paid":null,"fwci":0.4944,"has_fulltext":false,"cited_by_count":9,"citation_normalized_percentile":{"value":0.58751005,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":null,"biblio":{"volume":"73","issue":"1","first_page":"81","last_page":"89"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T11567","display_name":"semigroups and automata theory","score":0.9940000176429749,"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":0.9940000176429749,"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/alphabet","display_name":"Alphabet","score":0.8669268488883972},{"id":"https://openalex.org/keywords/free-product","display_name":"Free product","score":0.6701486110687256},{"id":"https://openalex.org/keywords/mathematics","display_name":"Mathematics","score":0.5953354239463806},{"id":"https://openalex.org/keywords/monoid","display_name":"Monoid","score":0.5388512015342712},{"id":"https://openalex.org/keywords/combinatorics-on-words","display_name":"Combinatorics on words","score":0.4796719551086426},{"id":"https://openalex.org/keywords/combinatorics","display_name":"Combinatorics","score":0.4317217767238617},{"id":"https://openalex.org/keywords/algebra-over-a-field","display_name":"Algebra over a field","score":0.37173935770988464},{"id":"https://openalex.org/keywords/pure-mathematics","display_name":"Pure mathematics","score":0.27207404375076294},{"id":"https://openalex.org/keywords/linguistics","display_name":"Linguistics","score":0.07801759243011475},{"id":"https://openalex.org/keywords/group","display_name":"Group (periodic table)","score":0.07393595576286316},{"id":"https://openalex.org/keywords/chemistry","display_name":"Chemistry","score":0.05604296922683716},{"id":"https://openalex.org/keywords/philosophy","display_name":"Philosophy","score":0.05216175317764282}],"concepts":[{"id":"https://openalex.org/C112876837","wikidata":"https://www.wikidata.org/wiki/Q837518","display_name":"Alphabet","level":2,"score":0.8669268488883972},{"id":"https://openalex.org/C47527751","wikidata":"https://www.wikidata.org/wiki/Q1454165","display_name":"Free product","level":3,"score":0.6701486110687256},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.5953354239463806},{"id":"https://openalex.org/C206901836","wikidata":"https://www.wikidata.org/wiki/Q208237","display_name":"Monoid","level":2,"score":0.5388512015342712},{"id":"https://openalex.org/C164804908","wikidata":"https://www.wikidata.org/wiki/Q2985058","display_name":"Combinatorics on words","level":3,"score":0.4796719551086426},{"id":"https://openalex.org/C114614502","wikidata":"https://www.wikidata.org/wiki/Q76592","display_name":"Combinatorics","level":1,"score":0.4317217767238617},{"id":"https://openalex.org/C136119220","wikidata":"https://www.wikidata.org/wiki/Q1000660","display_name":"Algebra over a field","level":2,"score":0.37173935770988464},{"id":"https://openalex.org/C202444582","wikidata":"https://www.wikidata.org/wiki/Q837863","display_name":"Pure mathematics","level":1,"score":0.27207404375076294},{"id":"https://openalex.org/C41895202","wikidata":"https://www.wikidata.org/wiki/Q8162","display_name":"Linguistics","level":1,"score":0.07801759243011475},{"id":"https://openalex.org/C2781311116","wikidata":"https://www.wikidata.org/wiki/Q83306","display_name":"Group (periodic table)","level":2,"score":0.07393595576286316},{"id":"https://openalex.org/C185592680","wikidata":"https://www.wikidata.org/wiki/Q2329","display_name":"Chemistry","level":0,"score":0.05604296922683716},{"id":"https://openalex.org/C138885662","wikidata":"https://www.wikidata.org/wiki/Q5891","display_name":"Philosophy","level":0,"score":0.05216175317764282},{"id":"https://openalex.org/C178790620","wikidata":"https://www.wikidata.org/wiki/Q11351","display_name":"Organic chemistry","level":1,"score":0.0}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1016/0304-3975(90)90163-c","is_oa":false,"landing_page_url":"https://doi.org/10.1016/0304-3975(90)90163-c","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":"Reduced inequalities","id":"https://metadata.un.org/sdg/10","score":0.4699999988079071}],"awards":[],"funders":[],"has_content":{"grobid_xml":false,"pdf":false},"content_urls":null,"referenced_works_count":9,"referenced_works":["https://openalex.org/W5686494","https://openalex.org/W42696899","https://openalex.org/W196919032","https://openalex.org/W1514324498","https://openalex.org/W2044893114","https://openalex.org/W2134847110","https://openalex.org/W4236031056","https://openalex.org/W6601756219","https://openalex.org/W6680077968"],"related_works":["https://openalex.org/W2383679568","https://openalex.org/W2963534902","https://openalex.org/W2131864548","https://openalex.org/W4298870704","https://openalex.org/W1634002241","https://openalex.org/W1989728373","https://openalex.org/W2105904493","https://openalex.org/W2950489119","https://openalex.org/W2766493899","https://openalex.org/W2952831402"],"abstract_inverted_index":null,"counts_by_year":[],"updated_date":"2026-03-10T14:07:55.174380","created_date":"2025-10-10T00:00:00"}