Essential and discrete spectrum of the Schrödinger operator of a system of two particles on a lattice. Uzbek Mathematical Journal, [S. l.], v. 70, n. 1, p. 107–115, 2026. DOI: 10.29229/uzmj.2026-1-11. Disponível em: https://uzmj.mathinst.uz/index.php/uzmj/article/view/284.. Acesso em: 26 mar. 2026.