MOLYBOGA, V. M.; MIKHAILETS, V. A. Remarks on Schrödinger operators with singular matrix potentials. Methods of Functional Analysis and Topology, [S. l.], v. 19, n. 2, p. 161–167, 2013. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/543. Acesso em: 18 dec. 2025.