DENYSENKO, O. M.; PARASYUK, I. O. Construction of Floquet–Bloch Solutions and Estimation of Lengths of Resonance Zones of One-Dimensional Schrödinger Equation with Smooth Potential. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 56, n. 1, p. 3–18, 2004. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3724. Acesso em: 27 apr. 2025.