MAKAROV, V. L. Exact and approximate solutions of spectral problems for the Schrödinger operator on (−∞,∞) with polynomial potential. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 70, n. 1, p. 79–93, 2018. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1543. Acesso em: 27 apr. 2025.