Perlow J
Theor Popul Biol. 1986 Oct;30(2):161-5. doi: 10.1016/0040-5809(86)90030-4.
The stationary density of homozygosity is obtained for a locus with four possible alleles and symmetric mutation between them. As conjectured by F. M. Stewart (1976, Theoret. Pop. Biol. 9, 188-201) this density has spikes at 1/3 and 1/2. The density under heterozygote selection is also given.