VOVKODAV, N. G.; SHLEPAKOV, L. N. On the Optimal Coefficient of Efficiency of a Semi-Markov System in the Scheme of Phase Lumping. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 56, n. 3, p. 339–345, 2004. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3757. Acesso em: 5 dec. 2025.