LIGĘZA, Jan. The distributional solutions of some systems of linear differential equations. Annales Mathematicae Silesianae, [S. l.], v. 3, p. 82–90, 1990. Disponível em: https://journals.us.edu.pl/index.php/AMSIL/article/view/14306. Acesso em: 9 jul. 2025.