{"id":"https://openalex.org/W2059619336","doi":"https://doi.org/10.1016/0196-6774(85)90024-0","title":"Two levels are as good as any","display_name":"Two levels are as good as any","publication_year":1985,"publication_date":"1985-03-01","ids":{"openalex":"https://openalex.org/W2059619336","doi":"https://doi.org/10.1016/0196-6774(85)90024-0","mag":"2059619336"},"language":"en","primary_location":{"id":"doi:10.1016/0196-6774(85)90024-0","is_oa":false,"landing_page_url":"https://doi.org/10.1016/0196-6774(85)90024-0","pdf_url":null,"source":{"id":"https://openalex.org/S110520077","display_name":"Journal of Algorithms","issn_l":"0196-6774","issn":["0196-6774","1090-2678"],"is_oa":false,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310319955","host_organization_name":"Academic Press","host_organization_lineage":["https://openalex.org/P4310319955","https://openalex.org/P4310320990"],"host_organization_lineage_names":["Academic Press","Elsevier BV"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Journal of Algorithms","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/A5035787595","display_name":"Markku Tamminen","orcid":null},"institutions":[{"id":"https://openalex.org/I32943570","display_name":"Helsinki Institute for Information Technology","ror":"https://ror.org/05kph4940","country_code":"FI","type":"facility","lineage":["https://openalex.org/I133731052","https://openalex.org/I32943570","https://openalex.org/I9927081"]}],"countries":["FI"],"is_corresponding":true,"raw_author_name":"Markku Tamminen","raw_affiliation_strings":["Laboratory of Information Processing Science, Helsinki University of Technology, 02150 ESP00 15, Helsinki, Finland"],"affiliations":[{"raw_affiliation_string":"Laboratory of Information Processing Science, Helsinki University of Technology, 02150 ESP00 15, Helsinki, Finland","institution_ids":["https://openalex.org/I32943570"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":1,"corresponding_author_ids":["https://openalex.org/A5035787595"],"corresponding_institution_ids":["https://openalex.org/I32943570"],"apc_list":null,"apc_paid":null,"fwci":0.5253,"has_fulltext":false,"cited_by_count":7,"citation_normalized_percentile":{"value":0.65085124,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":89,"max":94},"biblio":{"volume":"6","issue":"1","first_page":"138","last_page":"144"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T11716","display_name":"Random Matrices and Applications","score":0.9983000159263611,"subfield":{"id":"https://openalex.org/subfields/2613","display_name":"Statistics and Probability"},"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/T11716","display_name":"Random Matrices and Applications","score":0.9983000159263611,"subfield":{"id":"https://openalex.org/subfields/2613","display_name":"Statistics and Probability"},"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/T10588","display_name":"Mathematical Dynamics and Fractals","score":0.9980999827384949,"subfield":{"id":"https://openalex.org/subfields/2610","display_name":"Mathematical Physics"},"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/T11152","display_name":"Stochastic processes and statistical mechanics","score":0.9976999759674072,"subfield":{"id":"https://openalex.org/subfields/2610","display_name":"Mathematical Physics"},"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":0.40144145488739014},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.35384827852249146}],"concepts":[{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.40144145488739014},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.35384827852249146}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1016/0196-6774(85)90024-0","is_oa":false,"landing_page_url":"https://doi.org/10.1016/0196-6774(85)90024-0","pdf_url":null,"source":{"id":"https://openalex.org/S110520077","display_name":"Journal of Algorithms","issn_l":"0196-6774","issn":["0196-6774","1090-2678"],"is_oa":false,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310319955","host_organization_name":"Academic Press","host_organization_lineage":["https://openalex.org/P4310319955","https://openalex.org/P4310320990"],"host_organization_lineage_names":["Academic Press","Elsevier BV"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Journal of Algorithms","raw_type":"journal-article"}],"best_oa_location":null,"sustainable_development_goals":[],"awards":[],"funders":[],"has_content":{"pdf":false,"grobid_xml":false},"content_urls":null,"referenced_works_count":16,"referenced_works":["https://openalex.org/W10166594","https://openalex.org/W1533211841","https://openalex.org/W1560783858","https://openalex.org/W1976415178","https://openalex.org/W1999447420","https://openalex.org/W2001872280","https://openalex.org/W2006749054","https://openalex.org/W2017493520","https://openalex.org/W2023933062","https://openalex.org/W2030641205","https://openalex.org/W2032741426","https://openalex.org/W2043645331","https://openalex.org/W2059575356","https://openalex.org/W2099117306","https://openalex.org/W2798735774","https://openalex.org/W6674796100"],"related_works":["https://openalex.org/W2899084033","https://openalex.org/W2748952813","https://openalex.org/W2044189972","https://openalex.org/W1979597421","https://openalex.org/W1974891317","https://openalex.org/W2313400459","https://openalex.org/W4245490552","https://openalex.org/W4225152035","https://openalex.org/W2069964982","https://openalex.org/W2061531152"],"abstract_inverted_index":null,"counts_by_year":[{"year":2013,"cited_by_count":1}],"updated_date":"2025-11-06T03:46:38.306776","created_date":"2025-10-10T00:00:00"}
