Some properties of the Osvillatory and nonoscillatory solutions of second order. Baghdad Science Journal, Iraq, Baghdad, v. 2, n. 3, p. 517–521, 2021. DOI: 10.21123/bsj.2005.2.3.517-521. Disponível em: https://bsj.uobaghdad.edu.iq/index.php/BSJ/article/view/645.. Acesso em: 2 may. 2024.