MYKYTYUK, Ya. V.; HRYNIV, R. O. Self-adjointness of Schrödinger operators with singular potentials. Methods of Functional Analysis and Topology, [S. l.], v. 18, n. 2, p. 152–159, 2012. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/511. Acesso em: 16 dec. 2025.