JARCZYK, Witold. On non-negative solutions of a convolution equation. Annales Mathematicae Silesianae, [S. l.], v. 8, p. 85–95, 1994. Disponível em: https://journals.us.edu.pl/index.php/AMSIL/article/view/14220. Acesso em: 12 apr. 2025.