VALEYEV, K. G.; DZHALLADOVA, I. A. Derivation of Moment Equations for Solutions of a System of Differential Equations Dependent on a Semi-Markov Process. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 54, n. 11, p. 1569–1573, 2002. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4193. Acesso em: 7 apr. 2025.