O. Steen

Goshawk breeding densities in relation to mature forest in southeastern Norway

V. Selås, O. Steen, J. T. Johnsen, 2008 .

Genetic relationships in the peregrine falcon (Falco peregrinus) analysed by microsatellite DNA markers

K. Røed, J. Lifjeld, M. Nesje, 2000, Molecular ecology.