Bourgeon, S., Leat, E.H.K., Strøm, H., Furness, R.W., Magnusdottir, E., Fisk, A.T., Ellis, S., Petersen, Æ., Olafsdottir, K., Borgå, K., Hanssen, S.A. , Gabrielsen, G.W., Bustnes, J.O. 2012. Individual variation in biomarkers of health: Influence of persistent organic pollutants in Great skuas (Stercorarius skua) breeding at different geographical locations. Environmental Research 118: 31-39.