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Filters: 1 is biblio_year:2012 and 2 is biblio_year:2018 and 3 is biblio_year:1981 and 4 is biblio_type:Talk, keynote and 5 is biblio_year:2014 and 6 is biblio_year:2019 and 7 is biblio_type:Book and Author is Torleif Halkjelsvik  [Reset Search]