VITRYCHENKO, I. E. On oscillation of solutions of a nonautonomous quasilinear second-order equation. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 46, n. 4, p. 347–356, 1994. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5731. Acesso em: 15 dec. 2025.