LAPSHIN, A. L. Equations for second moments of solutions of a system of linear differential equations with random semi-Markov coefficients and random input. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 51, n. 6, p. 776–783, 1999. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4664. Acesso em: 14 apr. 2025.