{"id":"https://openalex.org/W631625320","doi":null,"title":"Calculations with years and months in the Peruvian quipus","display_name":"Calculations with years and months in the Peruvian quipus","publication_year":1925,"publication_date":"1925-01-01","ids":{"openalex":"https://openalex.org/W631625320","mag":"631625320"},"language":"en","primary_location":{"id":"mag:631625320","doi":null,"is_oa":false,"landing_page_url":"https://ci.nii.ac.jp/ncid/BB02261276","pdf_url":null,"source":{"id":"https://openalex.org/S4306469997","display_name":"Elanders Boktryckeri Aktiebolag eBooks","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"listed_in":[],"host_organization":null,"host_organization_name":null,"host_organization_lineage":[],"host_organization_lineage_names":[],"type":"ebook platform"},"license":null,"license_id":null,"version":null,"is_accepted":false,"is_published":false,"raw_source_name":"Elanders Boktryckeri Aktiebolag eBooks","raw_type":null},"volume":null,"type":"book","indexed_in":[],"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/A5089148760","display_name":"Erland Nordenski\u00f6ld","orcid":null,"observed_orcids":[]},"institutions":[],"countries":[],"is_corresponding":true,"raw_author_name":"Erland Nordenski\u00f6ld","raw_affiliation_strings":[],"raw_orcid":null,"affiliations":[]}],"institutions":[],"countries_distinct_count":0,"institutions_distinct_count":0,"corresponding_author_ids":["https://openalex.org/A5089148760"],"corresponding_institution_ids":[],"apc_list":null,"apc_paid":null,"fwci":201.6667,"has_fulltext":false,"cited_by_count":25,"citation_normalized_percentile":{"value":1.0,"is_in_top_1_percent":true,"is_in_top_10_percent":true},"cited_by_percentile_year":{"min":88,"max":96},"biblio":{"volume":null,"issue":null,"first_page":null,"last_page":null},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T12283","display_name":"Latin American history and culture","score":0.5468999743461609,"subfield":{"id":"https://openalex.org/subfields/1213","display_name":"Visual Arts and Performing Arts"},"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/T12283","display_name":"Latin American history and culture","score":0.5468999743461609,"subfield":{"id":"https://openalex.org/subfields/1213","display_name":"Visual Arts and Performing Arts"},"field":{"id":"https://openalex.org/fields/12","display_name":"Arts and Humanities"},"domain":{"id":"https://openalex.org/domains/2","display_name":"Social Sciences"}},{"id":"https://openalex.org/T12170","display_name":"History and Theory of Mathematics","score":0.15870000422000885,"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"}},{"id":"https://openalex.org/T13175","display_name":"Historical Astronomy and Related Studies","score":0.15320000052452087,"subfield":{"id":"https://openalex.org/subfields/3103","display_name":"Astronomy and Astrophysics"},"field":{"id":"https://openalex.org/fields/31","display_name":"Physics and Astronomy"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/quipu","display_name":"quipu","score":0.8980000019073486},{"id":"https://openalex.org/keywords/time-reckoning","display_name":"time reckoning","score":0.5509999990463257},{"id":"https://openalex.org/keywords/numerical-computation","display_name":"numerical computation","score":0.3930000066757202},{"id":"https://openalex.org/keywords/knotted-cords","display_name":"knotted cords","score":0.34200000762939453}],"concepts":[{"id":"https://openalex.org/C205649164","wikidata":"https://www.wikidata.org/wiki/Q1071","display_name":"Geography","level":0,"score":0.42410799860954285},{"id":"https://openalex.org/C95457728","wikidata":"https://www.wikidata.org/wiki/Q309","display_name":"History","level":0,"score":0.41952067613601685}],"mesh":[],"locations_count":1,"locations":[{"id":"mag:631625320","doi":null,"is_oa":false,"landing_page_url":"https://ci.nii.ac.jp/ncid/BB02261276","pdf_url":null,"source":{"id":"https://openalex.org/S4306469997","display_name":"Elanders Boktryckeri Aktiebolag eBooks","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"listed_in":[],"host_organization":null,"host_organization_name":null,"host_organization_lineage":[],"host_organization_lineage_names":[],"type":"ebook platform"},"license":null,"license_id":null,"version":null,"is_accepted":false,"is_published":false,"raw_source_name":"Elanders Boktryckeri Aktiebolag eBooks","raw_type":null}],"best_oa_location":null,"sustainable_development_goals":[],"study_designs":[],"awards":[],"funders":[],"has_content":{"pdf":false,"grobid_xml":false},"content_urls":null,"referenced_works_count":0,"referenced_works":[],"related_works":["https://openalex.org/W593121262","https://openalex.org/W2024464242","https://openalex.org/W6929716479","https://openalex.org/W6967295630","https://openalex.org/W6948329639","https://openalex.org/W7050521907","https://openalex.org/W4403316208","https://openalex.org/W6948306652","https://openalex.org/W6892321453","https://openalex.org/W6948794797"],"abstract_inverted_index":null,"counts_by_year":[{"year":2025,"cited_by_count":1},{"year":2021,"cited_by_count":1},{"year":2019,"cited_by_count":1},{"year":2016,"cited_by_count":2},{"year":2015,"cited_by_count":1},{"year":2014,"cited_by_count":1}],"updated_date":"2025-10-10T17:16:08.811792","created_date":"2016-06-24T00:00:00"}