MYKYTYUK, Ya. V.; HRYNIV, R. O. 1-D Schrödinger operators with singular Gordon potentials. Methods of Functional Analysis and Topology, [S. l.], v. 8, n. 1, p. 36–48, 2002. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/175. Acesso em: 18 dec. 2025.