MUZYCZKA, Zofia. On the existence of solutions of the differential equation with advanced argument. Annales Mathematicae Silesianae, [S. l.], v. 1, p. 89–92, 1985. Disponível em: https://journals.us.edu.pl/index.php/AMSIL/article/view/14338. Acesso em: 5 dec. 2025.