On the number of zeros of oscillating solutions to third and fourth order equations with power nonlinearity. Neliniini Kolyvannya, [S. l.], v. 17, n. 1, p. 16–31, 2014. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/724. Acesso em: 8 dec. 2025.