Halkka O, Raatikainen M, Halkka L, Hovinen R
Department of Genetics, University of Helsinki, 00100, Helsinki.
Department of Biology, University of Jyväskylä, 40100, Jyväskylä, Finland.
Evolution. 1975 Dec;29(4):700-706. doi: 10.1111/j.1558-5646.1975.tb00863.x.