Gleditsch, Nils Petter & Henrik Urdal (2004) Fredpris for treplanting? [Peace Prize for Planting Trees?], Aftenposten. 17 October.
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Gleditsch, Nils Petter & Henrik Urdal (2004) Fredpris for treplanting? [Peace Prize for Planting Trees?], Aftenposten. 17 October.