GOLOSHCHAPOVA, N. Multi-dimensional Schrödinger operators with point interactions. Methods of Functional Analysis and Topology, [S. l.], v. 17, n. 2, p. 126–143, 2011. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/477. Acesso em: 15 dec. 2025.