KIERAT, Władysław; SZTABA, Urszula. Differential equations of the second order with measures as coefficients. Annales Mathematicae Silesianae, [S. l.], v. 10, p. 79–86, 1996. Disponível em: https://trrest.vot.pl/ojsus/index.php/AMSIL/article/view/14194. Acesso em: 7 may. 2025.