{"id":"https://openalex.org/W2081584339","doi":"https://doi.org/10.1007/s00373-007-0720-5","title":"Jin Akiyama: A Friend and His Mathematics","display_name":"Jin Akiyama: A Friend and His Mathematics","publication_year":2007,"publication_date":"2007-06-01","ids":{"openalex":"https://openalex.org/W2081584339","doi":"https://doi.org/10.1007/s00373-007-0720-5","mag":"2081584339"},"language":"en","primary_location":{"id":"doi:10.1007/s00373-007-0720-5","is_oa":false,"landing_page_url":"https://doi.org/10.1007/s00373-007-0720-5","pdf_url":null,"source":{"id":"https://openalex.org/S186126824","display_name":"Graphs and Combinatorics","issn_l":"0911-0119","issn":["0911-0119","1435-5914"],"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":"Graphs and Combinatorics","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/A5062422841","display_name":"Mikio Kan\u014d","orcid":"https://orcid.org/0000-0002-7545-0327"},"institutions":[{"id":"https://openalex.org/I6178835","display_name":"Ibaraki University","ror":"https://ror.org/00sjd5653","country_code":"JP","type":"education","lineage":["https://openalex.org/I6178835"]},{"id":"https://openalex.org/I65143321","display_name":"Hitachi (Japan)","ror":"https://ror.org/02exqgm79","country_code":"JP","type":"company","lineage":["https://openalex.org/I65143321"]}],"countries":["JP"],"is_corresponding":true,"raw_author_name":"M. Kano","raw_affiliation_strings":["Department of Computer and Information Sciences, Ibaraki University, Hitachi, Ibaraki, 316-8511, Japan","Ibaraki University, Department of Computer and Information Sciences, 316-8511, Ibaraki, Hitachi, Japan"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Department of Computer and Information Sciences, Ibaraki University, Hitachi, Ibaraki, 316-8511, Japan","institution_ids":["https://openalex.org/I6178835","https://openalex.org/I65143321"]},{"raw_affiliation_string":"Ibaraki University, Department of Computer and Information Sciences, 316-8511, Ibaraki, Hitachi, Japan","institution_ids":["https://openalex.org/I6178835"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5020253829","display_name":"Mari-Jo P. Ruiz","orcid":null},"institutions":[{"id":"https://openalex.org/I19722","display_name":"Ateneo de Manila University","ror":"https://ror.org/053kevk63","country_code":"PH","type":"education","lineage":["https://openalex.org/I19722"]}],"countries":["PH"],"is_corresponding":false,"raw_author_name":"Mari-Jo P. Ruiz","raw_affiliation_strings":["Mathematics Department, School of Science and Engineering, Ateneo de Manila University, Quezon City, 1108, Philippines","Ateneo de Manila University, Mathematics Department, School of Science and Engineering, 1108, Quezon City, Hitachi, Philippines#TAB#"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Mathematics Department, School of Science and Engineering, Ateneo de Manila University, Quezon City, 1108, Philippines","institution_ids":["https://openalex.org/I19722"]},{"raw_affiliation_string":"Ateneo de Manila University, Mathematics Department, School of Science and Engineering, 1108, Quezon City, Hitachi, Philippines#TAB#","institution_ids":["https://openalex.org/I19722"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5068857927","display_name":"Jorge Urrutia","orcid":"https://orcid.org/0000-0002-4158-5979"},"institutions":[{"id":"https://openalex.org/I8961855","display_name":"Universidad Nacional Aut\u00f3noma de M\u00e9xico","ror":"https://ror.org/01tmp8f25","country_code":"MX","type":"education","lineage":["https://openalex.org/I8961855"]}],"countries":["MX"],"is_corresponding":false,"raw_author_name":"Jorge Urrutia","raw_affiliation_strings":["Instituto de Matem\u00e1ticas, Universidad Nacional Aut\u00f3noma de M\u00e9xico, M\u00e9xico D.F, M\u00e9xico","Universidad Nacional Aut\u00f3noma de M\u00e9xico, Instituto de Matem\u00e1ticas, 1108, M\u00e9xico D.F, Hitachi, M\u00e9xico#TAB#"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Instituto de Matem\u00e1ticas, Universidad Nacional Aut\u00f3noma de M\u00e9xico, M\u00e9xico D.F, M\u00e9xico","institution_ids":["https://openalex.org/I8961855"]},{"raw_affiliation_string":"Universidad Nacional Aut\u00f3noma de M\u00e9xico, Instituto de Matem\u00e1ticas, 1108, M\u00e9xico D.F, Hitachi, M\u00e9xico#TAB#","institution_ids":["https://openalex.org/I8961855"]}]}],"institutions":[],"countries_distinct_count":3,"institutions_distinct_count":3,"corresponding_author_ids":["https://openalex.org/A5062422841"],"corresponding_institution_ids":["https://openalex.org/I6178835","https://openalex.org/I65143321"],"apc_list":{"value":2290,"currency":"EUR","value_usd":2890},"apc_paid":null,"fwci":0.4424,"has_fulltext":false,"cited_by_count":2,"citation_normalized_percentile":{"value":0.63251353,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":89,"max":94},"biblio":{"volume":"23","issue":"S1","first_page":"1","last_page":"39"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T12504","display_name":"Mathematics and Applications","score":0.9901000261306763,"subfield":{"id":"https://openalex.org/subfields/2608","display_name":"Geometry and Topology"},"field":{"id":"https://openalex.org/fields/26","display_name":"Mathematics"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},"topics":[{"id":"https://openalex.org/T12504","display_name":"Mathematics and Applications","score":0.9901000261306763,"subfield":{"id":"https://openalex.org/subfields/2608","display_name":"Geometry and Topology"},"field":{"id":"https://openalex.org/fields/26","display_name":"Mathematics"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10374","display_name":"Advanced Graph Theory Research","score":0.9800999760627747,"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/T12170","display_name":"History and Theory of Mathematics","score":0.9729999899864197,"subfield":{"id":"https://openalex.org/subfields/2614","display_name":"Theoretical Computer Science"},"field":{"id":"https://openalex.org/fields/26","display_name":"Mathematics"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/mathematics","display_name":"Mathematics","score":0.6337574124336243},{"id":"https://openalex.org/keywords/combinatorics","display_name":"Combinatorics","score":0.5811280608177185},{"id":"https://openalex.org/keywords/genealogy","display_name":"Genealogy","score":0.3536049723625183},{"id":"https://openalex.org/keywords/mathematics-education","display_name":"Mathematics education","score":0.33613717555999756},{"id":"https://openalex.org/keywords/history","display_name":"History","score":0.14296084642410278}],"concepts":[{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.6337574124336243},{"id":"https://openalex.org/C114614502","wikidata":"https://www.wikidata.org/wiki/Q76592","display_name":"Combinatorics","level":1,"score":0.5811280608177185},{"id":"https://openalex.org/C53553401","wikidata":"https://www.wikidata.org/wiki/Q47307","display_name":"Genealogy","level":1,"score":0.3536049723625183},{"id":"https://openalex.org/C145420912","wikidata":"https://www.wikidata.org/wiki/Q853077","display_name":"Mathematics education","level":1,"score":0.33613717555999756},{"id":"https://openalex.org/C95457728","wikidata":"https://www.wikidata.org/wiki/Q309","display_name":"History","level":0,"score":0.14296084642410278}],"mesh":[],"locations_count":2,"locations":[{"id":"doi:10.1007/s00373-007-0720-5","is_oa":false,"landing_page_url":"https://doi.org/10.1007/s00373-007-0720-5","pdf_url":null,"source":{"id":"https://openalex.org/S186126824","display_name":"Graphs and Combinatorics","issn_l":"0911-0119","issn":["0911-0119","1435-5914"],"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":"Graphs and Combinatorics","raw_type":"journal-article"},{"id":"pmh:oai:CiteSeerX.psu:10.1.1.300.1275","is_oa":false,"landing_page_url":"http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.300.1275","pdf_url":null,"source":null,"license":null,"license_id":null,"version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"http://www.math.unam.mx/~urrutia/online_papers/Akiyama-Article.pdf","raw_type":"text"}],"best_oa_location":null,"sustainable_development_goals":[],"awards":[],"funders":[{"id":"https://openalex.org/F4320320698","display_name":"National University of Singapore","ror":"https://ror.org/01tgyzw49"}],"has_content":{"grobid_xml":false,"pdf":false},"content_urls":null,"referenced_works_count":70,"referenced_works":["https://openalex.org/W89794638","https://openalex.org/W94071207","https://openalex.org/W98606268","https://openalex.org/W132141549","https://openalex.org/W196469741","https://openalex.org/W586199317","https://openalex.org/W614287814","https://openalex.org/W1487626977","https://openalex.org/W1488370572","https://openalex.org/W1496241744","https://openalex.org/W1509034628","https://openalex.org/W1520952509","https://openalex.org/W1539895965","https://openalex.org/W1554994830","https://openalex.org/W1594091061","https://openalex.org/W1811953189","https://openalex.org/W1975558042","https://openalex.org/W1977332922","https://openalex.org/W1980392837","https://openalex.org/W1985263293","https://openalex.org/W1987223948","https://openalex.org/W1987525569","https://openalex.org/W1994739637","https://openalex.org/W2003962145","https://openalex.org/W2005247788","https://openalex.org/W2007832978","https://openalex.org/W2010042187","https://openalex.org/W2014334849","https://openalex.org/W2021404275","https://openalex.org/W2025085400","https://openalex.org/W2026745357","https://openalex.org/W2030563429","https://openalex.org/W2032688631","https://openalex.org/W2032879539","https://openalex.org/W2037165826","https://openalex.org/W2039451509","https://openalex.org/W2044427170","https://openalex.org/W2048484904","https://openalex.org/W2049446912","https://openalex.org/W2050127193","https://openalex.org/W2052295743","https://openalex.org/W2062772424","https://openalex.org/W2066364084","https://openalex.org/W2067830572","https://openalex.org/W2082242399","https://openalex.org/W2087348204","https://openalex.org/W2087518343","https://openalex.org/W2087952350","https://openalex.org/W2089301616","https://openalex.org/W2102797028","https://openalex.org/W2111439320","https://openalex.org/W2116274049","https://openalex.org/W2140322654","https://openalex.org/W2153855282","https://openalex.org/W2159351492","https://openalex.org/W2272912608","https://openalex.org/W2403421688","https://openalex.org/W2406865874","https://openalex.org/W2408176971","https://openalex.org/W2477320853","https://openalex.org/W2731891712","https://openalex.org/W2746731522","https://openalex.org/W4212836728","https://openalex.org/W4213091031","https://openalex.org/W4254305597","https://openalex.org/W4254462332","https://openalex.org/W4285719527","https://openalex.org/W4294651638","https://openalex.org/W4376544092","https://openalex.org/W4400541442"],"related_works":["https://openalex.org/W1979597421","https://openalex.org/W2007980826","https://openalex.org/W2061531152","https://openalex.org/W3002753104","https://openalex.org/W2077600819","https://openalex.org/W2142036596","https://openalex.org/W2072657027","https://openalex.org/W2600246793","https://openalex.org/W4238204885","https://openalex.org/W2963966623"],"abstract_inverted_index":null,"counts_by_year":[{"year":2020,"cited_by_count":1}],"updated_date":"2026-06-13T06:13:01.061226","created_date":"2025-10-10T00:00:00"}