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He has written several books on the subject of the occupation of Norway by Nazi Germany, including Lurøy-affæren from 1966, Operasjon Oleander from 1968, Når nøden er størst (on POW camps in Trøndelag) from 1969, Sluttspill i Rinnans bandekloster (on Sonderabteilung Lola) from 1971, and Gulltransporten (on the flight of the Norwegian National Treasury) from 1974.