Dag Olav Hessen
- "Gruppe 5: Biologi" (in Norwegian). Norwegian Academy of Science and Letters. Retrieved 28 October 2009.
- "Harald Eia, Dag Hessen og Bjørn Vassnes får Fritt Ords Honnør" (in Norwegian). Fritt Ord. 8 December 2010. Archived from the original on 18 December 2010. Retrieved 13 December 2010.
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