VALEYEV, K. G.; DZHALLADOVA, I. A. Derivation of Moment Equations for Solutions of a System of Nonlinear Difference Equations Dependent on a Semi-Markov Process. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 55, n. 6, p. 858–864, 2003. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3960. Acesso em: 5 dec. 2025.