PORTENKO, N. I. On Renewal Equations Appearing in Some Problems in the Theory of Generalized Diffusion Processes. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 57, n. 9, p. 1302–1312, 2005. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3686. Acesso em: 5 dec. 2025.