BERTOLINO, M. INTERGALITES DIFFERNTIELLES ET L’ANALYSE QUALITATIVE D’EQUATIONS DIFFERENTIELLES. Matematichki Bilten, [S. l.], v. 17, n. 1, 1967. Disponível em: https://bilten.smm.org.mk/index.php/bilten/article/view/1297. Acesso em: 13 jun. 2026.