{"id":"https://openalex.org/A5031925226","orcid":null,"observed_orcids":[],"display_name":"Pentti Hakkila","raw_author_names":["Hakkila, P.","Hakkila, Pentti","P. Hakkila","Pentti Hakkila"],"full_name":"Hakkila, Pentti","works_count":240,"cited_by_count":1305,"summary_stats":{"2yr_mean_citedness":0.0,"h_index":15,"i10_index":20},"ids":{"openalex":"https://openalex.org/A5031925226","orcid":null,"observed_orcids":[]},"affiliations":[{"institution":{"id":"https://openalex.org/I87653560","ror":"https://ror.org/04b181w54","display_name":"VTT Technical Research Centre of Finland","country_code":"FI","type":"nonprofit","lineage":["https://openalex.org/I4210089493","https://openalex.org/I87653560"]},"years":[2006,2005,2003,2002,2001]}],"last_known_institutions":null,"topics":[{"id":"https://openalex.org/T12118","display_name":"Forest Biomass Utilization and Management","count":121,"subfield":{"id":"https://openalex.org/subfields/2105","display_name":"Renewable Energy, Sustainability and the Environment"},"field":{"id":"https://openalex.org/fields/21","display_name":"Energy"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T14256","display_name":"Wood Residue Utilization and Solid Biofuels","count":112,"subfield":{"id":"https://openalex.org/subfields/1107","display_name":"Forestry"},"field":{"id":"https://openalex.org/fields/11","display_name":"Agricultural and Biological Sciences"},"domain":{"id":"https://openalex.org/domains/1","display_name":"Life Sciences"}},{"id":"https://openalex.org/T11753","display_name":"Forest Management and Policy","count":88,"subfield":{"id":"https://openalex.org/subfields/1107","display_name":"Forestry"},"field":{"id":"https://openalex.org/fields/11","display_name":"Agricultural and Biological Sciences"},"domain":{"id":"https://openalex.org/domains/1","display_name":"Life Sciences"}},{"id":"https://openalex.org/T11880","display_name":"Forest ecology and management","count":82,"subfield":{"id":"https://openalex.org/subfields/1107","display_name":"Forestry"},"field":{"id":"https://openalex.org/fields/11","display_name":"Agricultural and Biological Sciences"},"domain":{"id":"https://openalex.org/domains/1","display_name":"Life Sciences"}},{"id":"https://openalex.org/T10484","display_name":"Wood Treatment and Properties","count":50,"subfield":{"id":"https://openalex.org/subfields/2215","display_name":"Building and Construction"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"topic_share":[{"id":"https://openalex.org/T12118","display_name":"Forest Biomass Utilization and Management","value":0.0014022,"subfield":{"id":"https://openalex.org/subfields/2105","display_name":"Renewable Energy, Sustainability and the Environment"},"field":{"id":"https://openalex.org/fields/21","display_name":"Energy"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T14256","display_name":"Wood Residue Utilization and Solid Biofuels","value":0.0012414,"subfield":{"id":"https://openalex.org/subfields/1107","display_name":"Forestry"},"field":{"id":"https://openalex.org/fields/11","display_name":"Agricultural and Biological Sciences"},"domain":{"id":"https://openalex.org/domains/1","display_name":"Life Sciences"}},{"id":"https://openalex.org/T13240","display_name":"Bioeconomy and Sustainability Development","value":0.0002411,"subfield":{"id":"https://openalex.org/subfields/1100","display_name":"General Agricultural and Biological Sciences"},"field":{"id":"https://openalex.org/fields/11","display_name":"Agricultural and Biological Sciences"},"domain":{"id":"https://openalex.org/domains/1","display_name":"Life Sciences"}},{"id":"https://openalex.org/T11880","display_name":"Forest ecology and management","value":0.000221,"subfield":{"id":"https://openalex.org/subfields/1107","display_name":"Forestry"},"field":{"id":"https://openalex.org/fields/11","display_name":"Agricultural and Biological Sciences"},"domain":{"id":"https://openalex.org/domains/1","display_name":"Life Sciences"}},{"id":"https://openalex.org/T11753","display_name":"Forest Management and Policy","value":0.0002016,"subfield":{"id":"https://openalex.org/subfields/1107","display_name":"Forestry"},"field":{"id":"https://openalex.org/fields/11","display_name":"Agricultural and Biological Sciences"},"domain":{"id":"https://openalex.org/domains/1","display_name":"Life Sciences"}}],"x_concepts":[{"id":"39432304","wikidata":"https://www.wikidata.org/wiki/Q188847","display_name":"Environmental science","score":0.6038264036178589},{"id":"18762648","wikidata":"https://www.wikidata.org/wiki/Q42213","display_name":"Work (physics)","score":0.5485627055168152},{"id":"41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","score":0.5461000204086304},{"id":"205649164","wikidata":"https://www.wikidata.org/wiki/Q1071","display_name":"Geography","score":0.5116162896156311},{"id":"90673727","wikidata":"https://www.wikidata.org/wiki/Q901718","display_name":"Product (mathematics)","score":0.289900004863739}],"counts_by_year":[{"year":1960,"works_count":1,"oa_works_count":0,"cited_by_count":0},{"year":1962,"works_count":4,"oa_works_count":0,"cited_by_count":0},{"year":1963,"works_count":4,"oa_works_count":0,"cited_by_count":0},{"year":1964,"works_count":4,"oa_works_count":0,"cited_by_count":0},{"year":1966,"works_count":3,"oa_works_count":1,"cited_by_count":0},{"year":1967,"works_count":4,"oa_works_count":0,"cited_by_count":0},{"year":1968,"works_count":4,"oa_works_count":1,"cited_by_count":0},{"year":1969,"works_count":3,"oa_works_count":0,"cited_by_count":0},{"year":1970,"works_count":12,"oa_works_count":2,"cited_by_count":0},{"year":1971,"works_count":4,"oa_works_count":0,"cited_by_count":0},{"year":1972,"works_count":10,"oa_works_count":0,"cited_by_count":0},{"year":1973,"works_count":7,"oa_works_count":0,"cited_by_count":0},{"year":1974,"works_count":5,"oa_works_count":0,"cited_by_count":0},{"year":1975,"works_count":7,"oa_works_count":1,"cited_by_count":0},{"year":1976,"works_count":6,"oa_works_count":1,"cited_by_count":0},{"year":1978,"works_count":4,"oa_works_count":0,"cited_by_count":0},{"year":1979,"works_count":4,"oa_works_count":0,"cited_by_count":0},{"year":1980,"works_count":5,"oa_works_count":0,"cited_by_count":0},{"year":1981,"works_count":3,"oa_works_count":0,"cited_by_count":0},{"year":1982,"works_count":1,"oa_works_count":0,"cited_by_count":0},{"year":1983,"works_count":2,"oa_works_count":0,"cited_by_count":0},{"year":1984,"works_count":3,"oa_works_count":0,"cited_by_count":0},{"year":1985,"works_count":4,"oa_works_count":0,"cited_by_count":0},{"year":1986,"works_count":1,"oa_works_count":0,"cited_by_count":0},{"year":1989,"works_count":12,"oa_works_count":2,"cited_by_count":0},{"year":1991,"works_count":2,"oa_works_count":0,"cited_by_count":0},{"year":1992,"works_count":4,"oa_works_count":0,"cited_by_count":0},{"year":1993,"works_count":4,"oa_works_count":0,"cited_by_count":0},{"year":1994,"works_count":10,"oa_works_count":0,"cited_by_count":0},{"year":1995,"works_count":13,"oa_works_count":0,"cited_by_count":0},{"year":1996,"works_count":13,"oa_works_count":2,"cited_by_count":0},{"year":1997,"works_count":15,"oa_works_count":1,"cited_by_count":0},{"year":1998,"works_count":10,"oa_works_count":0,"cited_by_count":0},{"year":1999,"works_count":3,"oa_works_count":0,"cited_by_count":0},{"year":2000,"works_count":5,"oa_works_count":2,"cited_by_count":0},{"year":2001,"works_count":27,"oa_works_count":0,"cited_by_count":0},{"year":2002,"works_count":5,"oa_works_count":0,"cited_by_count":0},{"year":2003,"works_count":1,"oa_works_count":0,"cited_by_count":0},{"year":2005,"works_count":2,"oa_works_count":1,"cited_by_count":0},{"year":2006,"works_count":2,"oa_works_count":1,"cited_by_count":0},{"year":2009,"works_count":2,"oa_works_count":0,"cited_by_count":0},{"year":2012,"works_count":0,"oa_works_count":0,"cited_by_count":88},{"year":2013,"works_count":0,"oa_works_count":0,"cited_by_count":81},{"year":2014,"works_count":0,"oa_works_count":0,"cited_by_count":72},{"year":2015,"works_count":1,"oa_works_count":0,"cited_by_count":61},{"year":2016,"works_count":1,"oa_works_count":1,"cited_by_count":58},{"year":2017,"works_count":0,"oa_works_count":0,"cited_by_count":36},{"year":2018,"works_count":0,"oa_works_count":0,"cited_by_count":33},{"year":2019,"works_count":0,"oa_works_count":0,"cited_by_count":38},{"year":2020,"works_count":2,"oa_works_count":1,"cited_by_count":30},{"year":2021,"works_count":0,"oa_works_count":0,"cited_by_count":41},{"year":2022,"works_count":0,"oa_works_count":0,"cited_by_count":35},{"year":2023,"works_count":0,"oa_works_count":0,"cited_by_count":24},{"year":2024,"works_count":1,"oa_works_count":1,"cited_by_count":28},{"year":2025,"works_count":0,"oa_works_count":0,"cited_by_count":12},{"year":2026,"works_count":0,"oa_works_count":0,"cited_by_count":1}],"display_name_alternatives":["Hakkila, P.","Hakkila, Pentti","P. Hakkila","Pentti Hakkila"],"block_key":"p hakkila","works_api_url":"https://api.openalex.org/works?filter=author.id:A5031925226","awards_count":0,"updated_date":"2026-11-09T14:06:01","created_date":"2016-06-24T00:00:00"}