KLACZAK, Jerzy. Kneser Oscillation Theorem for differential equations with piecewise constant argument. Annales Mathematicae Silesianae, [S. l.], v. 5, p. 51–56, 1991. Disponível em: https://journals.us.edu.pl/index.php/AMSIL/article/view/14281. Acesso em: 18 apr. 2025.