Oscillation of a class of nonlinear partial difference equations with continuous variables. Neliniini Kolyvannya, [S. l.], v. 13, n. 3, p. 305–313, 2010. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/566. Acesso em: 21 jan. 2026.