Exact and approximate solutions of the spectral problems for the differential Schrödinger operator with a polynomial potential in ${\mathbb R}^{k}$, $k\ge 2$. Neliniini Kolyvannya, [S. l.], v. 21, n. 1, p. 66–98, 2018. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/897. Acesso em: 21 jan. 2026.