GUSAK, D. V. Sojourn time of almost semicontinuous integral-valued processes in a fixed state. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 63, n. 8, p. 1021–1029, 2011. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2782. Acesso em: 5 dec. 2025.