BYSZEWSKI, Ludwik. Existence and uniqueness of classical solution to Darboux problem together with nonlocal conditions. Annales Mathematicae Silesianae, [S. l.], v. 27, p. 67–74, 2013. Disponível em: https://trrest.vot.pl/ojsus/index.php/AMSIL/article/view/14002. Acesso em: 4 jul. 2025.