NÆSJE, Tor F., et al. “Genetic and Morphometric Differentiation Among Sympatric Spawning Stocks of Whitefish (Coregonus Lavaretus L.) in Lake Femund, Norway”. Journal of Limnology, vol. 63, no. 2, Aug. 2004, pp. 233-4, doi:10.4081/jlimnol.2004.233.