Jamilov, U.U., and M. Ladra. “On $(s,t)$-Volterra Quadratic Stochastic Operators of a Bisexual Population”. Journal of Applied Nonlinear Dynamics, vol. 9, no. 4, Aug. 2026, pp. 575-88, https://doi.org/10.5890/JAND.2020.12.005.