BATCHENKO, V.; GESZTESY, F. The spectrum of Schrödinger operators with quasi-periodic algebro-geometric KdV potentials. Математическая физика, анализ, геометрия, Харків, Україна, v. 10, n. 4, p. 447–468, 2003. Disponível em: https://mag.ilt.kharkiv.ua/index.php/mag/article/view/m10-0447e. Acesso em: 4 груд. 2024.