Wiig, Øystein and Øritsland, T. 1987. The Grey Seal Halichoerus grypus (Fabricius) and the Common Seal Phoca vitulina L. in Sogn og Fjordane, western Norway. Fauna norvegica. 8, (Dec. 1987), 21-24. DOI:https://doi.org/10.5324/fn.v8i0.6091.