{"id":"https://openalex.org/A5000699041","orcid":null,"observed_orcids":[],"display_name":"Gerhard Opfer","raw_author_names":["G. Opfer","GERHARD OPFER","Gerhard Opfer","Opfer, G.","Opfer, Gerhard","Opfer, Gerhard 1935-"],"full_name":"Gerhard Opfer","works_count":121,"cited_by_count":614,"summary_stats":{"2yr_mean_citedness":0.0,"h_index":13,"i10_index":20},"ids":{"openalex":"https://openalex.org/A5000699041","orcid":null,"observed_orcids":[]},"affiliations":[{"institution":{"id":"https://openalex.org/I159176309","ror":"https://ror.org/00g30e956","display_name":"Universit\u00e4t Hamburg","country_code":"DE","type":"education","lineage":["https://openalex.org/I159176309"]},"years":[2019,2018,2017,2015,2014,2013,2010,2009,2007,2005,2004,2002,2001,1999,1998,1994,1991,1987,1986,1984,1983,1982,1981,1980,1979,1978,1973,1971,1969]},{"institution":{"id":"https://openalex.org/I4210119109","ror":"https://ror.org/02k40bc56","display_name":"Indiana University Bloomington","country_code":"US","type":"education","lineage":["https://openalex.org/I4210119109","https://openalex.org/I592451"]},"years":[1981,1970]},{"institution":{"id":"https://openalex.org/I43406934","ror":"https://ror.org/04sjchr03","display_name":"Universit\u00e9 Laval","country_code":"CA","type":"education","lineage":["https://openalex.org/I43406934"]},"years":[2004]},{"institution":{"id":"https://openalex.org/I592451","ror":"https://ror.org/01kg8sb98","display_name":"Indiana University","country_code":"US","type":"education","lineage":["https://openalex.org/I592451"]},"years":[1981,1970]},{"institution":{"id":"https://openalex.org/I9073902","ror":"https://ror.org/05ggn0a85","display_name":"University of Chemistry and Technology, Prague","country_code":"CZ","type":"education","lineage":["https://openalex.org/I9073902"]},"years":[2009]}],"last_known_institutions":null,"topics":[{"id":"https://openalex.org/T11191","display_name":"Mathematical functions and polynomials","count":62,"subfield":{"id":"https://openalex.org/subfields/2604","display_name":"Applied Mathematics"},"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/T13806","display_name":"Mathematical and Computational Methods","count":55,"subfield":{"id":"https://openalex.org/subfields/2611","display_name":"Modeling and Simulation"},"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/T10792","display_name":"Matrix Theory and Algorithms","count":27,"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/T12037","display_name":"Algebraic and Geometric Analysis","count":25,"subfield":{"id":"https://openalex.org/subfields/2604","display_name":"Applied Mathematics"},"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/T11697","display_name":"Numerical Methods and Algorithms","count":19,"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"}}],"topic_share":[{"id":"https://openalex.org/T12037","display_name":"Algebraic and Geometric Analysis","value":0.0007152,"subfield":{"id":"https://openalex.org/subfields/2604","display_name":"Applied Mathematics"},"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/T11191","display_name":"Mathematical functions and polynomials","value":0.0002841,"subfield":{"id":"https://openalex.org/subfields/2604","display_name":"Applied Mathematics"},"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/T11697","display_name":"Numerical Methods and Algorithms","value":0.0002476,"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/T12404","display_name":"Mathematical Approximation and Integration","value":0.0002156,"subfield":{"id":"https://openalex.org/subfields/2612","display_name":"Numerical Analysis"},"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/T12661","display_name":"Iterative Methods for Nonlinear Equations","value":0.0001636,"subfield":{"id":"https://openalex.org/subfields/2612","display_name":"Numerical Analysis"},"field":{"id":"https://openalex.org/fields/26","display_name":"Mathematics"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"x_concepts":[{"id":"33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","score":0.9171331524848938},{"id":"41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","score":0.6014000177383423},{"id":"202444582","wikidata":"https://www.wikidata.org/wiki/Q837863","display_name":"Pure mathematics","score":0.5550569891929626},{"id":"121332964","wikidata":"https://www.wikidata.org/wiki/Q413","display_name":"Physics","score":0.5542004704475403},{"id":"138885662","wikidata":"https://www.wikidata.org/wiki/Q5891","display_name":"Philosophy","score":0.5048204064369202}],"counts_by_year":[{"year":1969,"works_count":1,"oa_works_count":0,"cited_by_count":0},{"year":1970,"works_count":1,"oa_works_count":0,"cited_by_count":0},{"year":1971,"works_count":1,"oa_works_count":0,"cited_by_count":0},{"year":1972,"works_count":1,"oa_works_count":0,"cited_by_count":0},{"year":1973,"works_count":3,"oa_works_count":0,"cited_by_count":0},{"year":1974,"works_count":1,"oa_works_count":0,"cited_by_count":0},{"year":1975,"works_count":1,"oa_works_count":0,"cited_by_count":0},{"year":1978,"works_count":2,"oa_works_count":2,"cited_by_count":0},{"year":1979,"works_count":3,"oa_works_count":0,"cited_by_count":0},{"year":1980,"works_count":2,"oa_works_count":0,"cited_by_count":0},{"year":1981,"works_count":1,"oa_works_count":1,"cited_by_count":0},{"year":1982,"works_count":4,"oa_works_count":1,"cited_by_count":0},{"year":1983,"works_count":2,"oa_works_count":1,"cited_by_count":0},{"year":1984,"works_count":1,"oa_works_count":1,"cited_by_count":0},{"year":1985,"works_count":1,"oa_works_count":0,"cited_by_count":0},{"year":1986,"works_count":1,"oa_works_count":1,"cited_by_count":0},{"year":1987,"works_count":1,"oa_works_count":0,"cited_by_count":0},{"year":1990,"works_count":1,"oa_works_count":0,"cited_by_count":0},{"year":1991,"works_count":2,"oa_works_count":2,"cited_by_count":0},{"year":1992,"works_count":2,"oa_works_count":1,"cited_by_count":0},{"year":1993,"works_count":10,"oa_works_count":0,"cited_by_count":0},{"year":1994,"works_count":13,"oa_works_count":0,"cited_by_count":0},{"year":1995,"works_count":1,"oa_works_count":0,"cited_by_count":0},{"year":1998,"works_count":1,"oa_works_count":0,"cited_by_count":0},{"year":1999,"works_count":2,"oa_works_count":1,"cited_by_count":0},{"year":2001,"works_count":13,"oa_works_count":1,"cited_by_count":0},{"year":2002,"works_count":12,"oa_works_count":0,"cited_by_count":0},{"year":2003,"works_count":4,"oa_works_count":0,"cited_by_count":0},{"year":2004,"works_count":3,"oa_works_count":0,"cited_by_count":0},{"year":2005,"works_count":4,"oa_works_count":0,"cited_by_count":0},{"year":2007,"works_count":2,"oa_works_count":0,"cited_by_count":0},{"year":2008,"works_count":4,"oa_works_count":0,"cited_by_count":0},{"year":2009,"works_count":4,"oa_works_count":0,"cited_by_count":0},{"year":2010,"works_count":3,"oa_works_count":0,"cited_by_count":0},{"year":2012,"works_count":0,"oa_works_count":0,"cited_by_count":7},{"year":2013,"works_count":6,"oa_works_count":1,"cited_by_count":44},{"year":2014,"works_count":2,"oa_works_count":1,"cited_by_count":18},{"year":2015,"works_count":1,"oa_works_count":1,"cited_by_count":18},{"year":2016,"works_count":0,"oa_works_count":0,"cited_by_count":11},{"year":2017,"works_count":1,"oa_works_count":0,"cited_by_count":12},{"year":2018,"works_count":1,"oa_works_count":0,"cited_by_count":24},{"year":2019,"works_count":1,"oa_works_count":0,"cited_by_count":23},{"year":2020,"works_count":0,"oa_works_count":0,"cited_by_count":12},{"year":2021,"works_count":0,"oa_works_count":0,"cited_by_count":13},{"year":2022,"works_count":0,"oa_works_count":0,"cited_by_count":20},{"year":2023,"works_count":1,"oa_works_count":1,"cited_by_count":12},{"year":2024,"works_count":0,"oa_works_count":0,"cited_by_count":13},{"year":2025,"works_count":0,"oa_works_count":0,"cited_by_count":20},{"year":2026,"works_count":0,"oa_works_count":0,"cited_by_count":13}],"display_name_alternatives":["G. Opfer","GERHARD OPFER","Gerhard Opfer","Opfer, G.","Opfer, Gerhard","Opfer, Gerhard 1935-"],"block_key":"g opfer","works_api_url":"https://api.openalex.org/works?filter=author.id:A5000699041","awards_count":0,"awards_api_url":"https://api.openalex.org/awards?filter=investigators.author.id:A5000699041","updated_date":"2026-11-10T14:30:39","created_date":"2016-06-24T00:00:00"}