CoadR. W. “Diffusion Approximation of the Wright-Fisher Model of Population Genetics: Single-Locus Two Alleles”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 52, no. 3, Mar. 2000, pp. 336-45, https://umj.imath.kiev.ua/index.php/umj/article/view/4423.