Bustnes, J. O., M. Helberg, and B.-J. Bårdsen. “Reproductive Success of Threatened Northern Lesser Black-Backed Gulls (Larus Fuscus Fuscus) in Relation to Nest Predation by Ravens (Corvus Corax)”. 2022. Ornis Fennica, vol. 99, no. 1, June 2022, pp. 1-14, doi:10.51812/of.115081.