COMBESCURE, Monique; ROBERT, Didier. Quadratic Quantum Hamiltonians revisited. CUBO, A Mathematical Journal, [S. l.], v. 8, n. 1, p. 61–86, 2006. Disponível em: https://cubo.ufro.cl/index.php/cubo/article/view/1612. Acesso em: 12 oct. 2025.