Eriksson, M. O. G., Dahlgren, T., Holmer, A., Lindberg, P., & Åhlund, M. (2005). Breeding success of the Black-throated Diver Gavia arctica inside and outside bird sanctuaries in Lakes Fegen and Sottern. Ornis Svecica, 15(4), 212–219. https://doi.org/10.34080/os.v15.22728