MOLYBOGA, V. M.; MIKHAILETS, V. A. Hill’s potentials in Hörmander spaces and their spectral gaps. Methods of Functional Analysis and Topology, [S. l.], v. 17, n. 3, p. 235–243, 2011. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/489. Acesso em: 16 dec. 2025.