Zhamilov, U. U., and U. A. Rozikov. “Volterra Quadratic Stochastic Operators of a Two-Sex Population”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 63, no. 7, July 2011, pp. 985-98, https://umj.imath.kiev.ua/index.php/umj/article/view/2779.