GUSAK, D. V. Ruin problem for an inhomogeneous semicontinuous integer-valued process. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 52, n. 2, p. 208–219, 2000. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4409. Acesso em: 5 dec. 2025.