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As a novelist, Eggen made his debut with an about the life and death of general Carl Gustav Fleischer, the Norwegian commander in chief at Narvik 1940. He also wrote a portrait of the writer Agnar Mykle, his father-in-law and has written novels with topics from medieval Norway. In 1993 Eggen published The boy from Gimle—the autobiographical story of a Norwegian childhood in a Nazi milieu. As a consequence, two years later the Norwegian war children got an official excuse. Eggen became a State Scholar in 2003. "He is a symbol of an entire generation", the spokesman for the Norwegian Labour Party said in parliament.
- Norwegian Government on Eggen (in English)
- Stortinget: Møte fredag den 14. December kl. 10 2001 (in Norwegian)
- An interview with Eggen