Construction of the boundaries of instability zones for the quasiperiodic Schrödinger equation with trigonometric potential. Neliniini Kolyvannya, [S. l.], v. 10, n. 1, p. 83–92, 2007. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/422. Acesso em: 21 jan. 2026.