BIIRDEINYI, A. G.; SVISHCHUK, A. V. Stability of semi-markov evolution systems and its application in financial mathematics. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 48, n. 10, p. 1386–1401, 1996. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5224. Acesso em: 5 dec. 2025.