The even-order harmonic oscillator perturbed by a decreasing scalar potential. Gulf Journal of Mathematics, [S. l.], v. 19, n. 1, p. 136–155, 2025. DOI: 10.56947/gjom.v19i1.2470. Disponível em: https://www.gjom.org/index.php/gjom/article/view/2470. Acesso em: 26 oct. 2026.