Eriksson, M.O.G. et al. 2005. Breeding success of the Black-throated Diver Gavia arctica inside and outside bird sanctuaries in Lakes Fegen and Sottern. Ornis Svecica. 15, 4 (Oct. 2005), 212–219. DOI:https://doi.org/10.34080/os.v15.22728.