NIKODEM, Kazimierz. On some properties of quadratic stochastic processes. Annales Mathematicae Silesianae, [S. l.], v. 3, p. 58–69, 1990. Disponível em: https://journals.us.edu.pl/index.php/AMSIL/article/view/14303. Acesso em: 18 apr. 2025.