Þröstur Eysteinsson 1955; Nordic Group for the Management of Genetic Resources of Trees (2003 :Húsavík); Norræni Skógerfðafræðihópurinn (2003 :Húsavík)(Rannsóknastöð Skógræktar, 08.2004)
Strategies, Science and Law for the Conservation of the World Soil Resources (2005 :Selfoss)(Landbúnaðarháskóli Íslands; Soil Conservation and Protection for Europe, 09.2005)