1. Rovfuglene i naturens husholdning;Barth;Sterna,1958
2. Bengtson , S.-A Observations on the nesting of the Gyrfalcon (Falco rusticolus) in Lake Myvatn area in 1960-70 (Icelandic, with a summary in English) Náttúrufraedingurinn
3. Ecology of the Peregrine and Gyrfalcon population in Alaska;Cade;Univ. Calif. Pubis. Zool,1960
4. On the determination of the size and composition of a passerine bird population during the breeding season;Enemar;Vår Fågelvärld, Suppl,1959
5. Some reflections on Ptarmigan cycles in Iceland;Gudmundsson;Proc. Int. Orn. Congr,1960