SZAFRANSKI, Z.; SZMANDA, B. OSCILLATIONS IN CERTAIN DIFFERENCE EQUATIONS. Tamkang Journal of Mathematics, [S. l.], v. 27, n. 3, p. 257–265, 1997. DOI: 10.5556/j.tkjm.27.1996.4342. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/4342. Acesso em: 5 may. 2024.