{"id":"https://openalex.org/W2005648459","doi":"https://doi.org/10.1007/bf00226262","title":"Conjugate point problems","display_name":"Conjugate point problems","publication_year":1969,"publication_date":"1969-09-01","ids":{"openalex":"https://openalex.org/W2005648459","doi":"https://doi.org/10.1007/bf00226262","mag":"2005648459"},"language":"en","primary_location":{"id":"doi:10.1007/bf00226262","doi":"https://doi.org/10.1007/bf00226262","is_oa":false,"landing_page_url":"https://doi.org/10.1007/bf00226262","pdf_url":null,"source":{"id":"https://openalex.org/S10873449","display_name":"Space Science Reviews","issn_l":"0038-6308","issn":["0038-6308","1572-9672"],"is_oa":false,"is_in_doaj":false,"is_core":true,"listed_in":["cwts-core","dongbi-b","jufo-3","norway-1","poland-140","russia-white-list-1"],"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":"Space Science Reviews","raw_type":"journal-article"},"volume":null,"type":"article","is_traditional":true,"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/A5083504095","display_name":"Takasi Oguti","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I74801974","display_name":"The University of Tokyo","ror":"https://ror.org/057zh3y96","country_code":"JP","type":"education","lineage":["https://openalex.org/I74801974"]}],"countries":["JP"],"is_corresponding":true,"raw_author_name":"Takasi Oguti","raw_affiliation_strings":["Geophysics Research Laboratory, University of Tokyo, Japan"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Geophysics Research Laboratory, University of Tokyo, Japan","institution_ids":["https://openalex.org/I74801974"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":1,"corresponding_author_ids":["https://openalex.org/A5083504095"],"corresponding_institution_ids":["https://openalex.org/I74801974"],"apc_list":{"value":5290,"currency":"USD","value_usd":5290},"apc_paid":null,"fwci":5.8541,"has_fulltext":false,"cited_by_count":27,"citation_normalized_percentile":{"value":0.93645687,"is_in_top_1_percent":false,"is_in_top_10_percent":true},"cited_by_percentile_year":{"min":87,"max":97},"biblio":{"volume":"9","issue":"6","first_page":null,"last_page":null},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T11082","display_name":"Spacecraft Dynamics and Control","score":0.2581000030040741,"subfield":{"id":"https://openalex.org/subfields/2202","display_name":"Aerospace Engineering"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},"topics":[{"id":"https://openalex.org/T11082","display_name":"Spacecraft Dynamics and Control","score":0.2581000030040741,"subfield":{"id":"https://openalex.org/subfields/2202","display_name":"Aerospace Engineering"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10039","display_name":"Stellar, planetary, and galactic studies","score":0.11789999902248383,"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"}},{"id":"https://openalex.org/T10159","display_name":"Ionosphere and magnetosphere dynamics","score":0.07859999686479568,"subfield":{"id":"https://openalex.org/subfields/1912","display_name":"Space and Planetary Science"},"field":{"id":"https://openalex.org/fields/19","display_name":"Earth and Planetary Sciences"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/conjugate-points","display_name":"conjugate points","score":0.9580000042915344},{"id":"https://openalex.org/keywords/celestial-mechanics","display_name":"celestial mechanics","score":0.5929999947547913},{"id":"https://openalex.org/keywords/orbital-mechanics","display_name":"orbital dynamics","score":0.3580000102519989},{"id":"https://openalex.org/keywords/periodic-orbits","display_name":"periodic orbits","score":0.4699999988079071}],"concepts":[{"id":"https://openalex.org/C2776716506","wikidata":"https://www.wikidata.org/wiki/Q5161158","display_name":"Conjugate points","level":2,"score":0.6400867700576782},{"id":"https://openalex.org/C197336794","wikidata":"https://www.wikidata.org/wiki/Q5161150","display_name":"Conjugate","level":2,"score":0.5668118000030518},{"id":"https://openalex.org/C28719098","wikidata":"https://www.wikidata.org/wiki/Q44946","display_name":"Point (geometry)","level":2,"score":0.46549829840660095},{"id":"https://openalex.org/C121332964","wikidata":"https://www.wikidata.org/wiki/Q413","display_name":"Physics","level":0,"score":0.4192942678928375},{"id":"https://openalex.org/C1276947","wikidata":"https://www.wikidata.org/wiki/Q333","display_name":"Astronomy","level":1,"score":0.38597142696380615},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.3111083507537842},{"id":"https://openalex.org/C2524010","wikidata":"https://www.wikidata.org/wiki/Q8087","display_name":"Geometry","level":1,"score":0.22850632667541504},{"id":"https://openalex.org/C134306372","wikidata":"https://www.wikidata.org/wiki/Q7754","display_name":"Mathematical analysis","level":1,"score":0.2144077718257904}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1007/bf00226262","doi":"https://doi.org/10.1007/bf00226262","is_oa":false,"landing_page_url":"https://doi.org/10.1007/bf00226262","pdf_url":null,"source":{"id":"https://openalex.org/S10873449","display_name":"Space Science Reviews","issn_l":"0038-6308","issn":["0038-6308","1572-9672"],"is_oa":false,"is_in_doaj":false,"is_core":true,"listed_in":["cwts-core","dongbi-b","jufo-3","norway-1","poland-140","russia-white-list-1"],"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":"Space Science Reviews","raw_type":"journal-article"}],"best_oa_location":null,"sustainable_development_goals":[],"study_designs":[],"awards":[],"funders":[],"has_content":{"grobid_xml":false,"pdf":false},"content_urls":null,"referenced_works_count":51,"referenced_works":["https://openalex.org/W206733545","https://openalex.org/W1971366563","https://openalex.org/W1973210452","https://openalex.org/W1982487520","https://openalex.org/W1986725958","https://openalex.org/W1986880004","https://openalex.org/W1992309301","https://openalex.org/W2000000689","https://openalex.org/W2007129137","https://openalex.org/W2009721344","https://openalex.org/W2012862558","https://openalex.org/W2015392064","https://openalex.org/W2016868715","https://openalex.org/W2020530145","https://openalex.org/W2021231145","https://openalex.org/W2028254757","https://openalex.org/W2033297962","https://openalex.org/W2040961603","https://openalex.org/W2042684952","https://openalex.org/W2044484674","https://openalex.org/W2045472964","https://openalex.org/W2045634365","https://openalex.org/W2047556685","https://openalex.org/W2048043275","https://openalex.org/W2049008549","https://openalex.org/W2049832093","https://openalex.org/W2050140766","https://openalex.org/W2050810195","https://openalex.org/W2052594101","https://openalex.org/W2071129804","https://openalex.org/W2075791050","https://openalex.org/W2075847750","https://openalex.org/W2079714500","https://openalex.org/W2080453280","https://openalex.org/W2081891911","https://openalex.org/W2083711137","https://openalex.org/W2088773024","https://openalex.org/W2094878361","https://openalex.org/W2098980040","https://openalex.org/W2104299675","https://openalex.org/W2116161278","https://openalex.org/W2118811593","https://openalex.org/W2127154723","https://openalex.org/W2130699047","https://openalex.org/W2131301389","https://openalex.org/W2142324440","https://openalex.org/W2145679660","https://openalex.org/W2154929942","https://openalex.org/W2157180408","https://openalex.org/W2158794144","https://openalex.org/W2271401047"],"related_works":["https://openalex.org/W2067524194","https://openalex.org/W4253690044","https://openalex.org/W2791829577","https://openalex.org/W2980236621","https://openalex.org/W4250066619","https://openalex.org/W624145301","https://openalex.org/W3108501436","https://openalex.org/W639122289","https://openalex.org/W981443099","https://openalex.org/W4247695956"],"abstract_inverted_index":null,"counts_by_year":[{"year":2025,"cited_by_count":2},{"year":2024,"cited_by_count":2},{"year":2023,"cited_by_count":1},{"year":2022,"cited_by_count":2},{"year":2021,"cited_by_count":1},{"year":2020,"cited_by_count":1},{"year":2019,"cited_by_count":1},{"year":2018,"cited_by_count":3},{"year":2017,"cited_by_count":1}],"updated_date":"2026-09-22T06:50:58.402377","created_date":"2016-06-24T00:00:00"}