Modernist literature was introduced to Norway through the literature of Knut Hamsun and Sigbjørn Obstfelder in the 1890s. In the 1930s Emil Boyson, Gunnar Larsen, Haakon Bugge Mahrt, Rolf Stenersen and Edith Øberg were among the Norwegian authors who experimented with prose modernism. The literature in the first years after the Second World War was characterized by a long series of documentary reports from people who had been in German custody, or who had participated in the resistance efforts during the occupation. In the 20th century notable Norwegian writers include the two Nobel Prize-winning authors, Knut Hamsun and Sigrid Undset. The period after 1965 represented a sharp expansion of market for Norwegian fiction and the 1970s produced both politicization and empowerment of Norwegian authors. The 1980s has been labeled the "fantasy decade" in Norwegian literature.