DIMITROVSKI, Dragan; PIPEREVSKI, Boro; ILIEVSKI, Borko. SECOND MACEDONIAN SIMPOSIUM OF DIFFERENTIAL EQUATIONS. Matematichki Bilten, [S. l.], v. 17, n. 1, p. 125–128, 1993. Disponível em: https://bilten.smm.org.mk/index.php/bilten/article/view/1508. Acesso em: 14 aug. 2026.