ABDULLAEV, J. I.; KHALKHUZHAEV, A. M.; KULIEV, K. D. The existence of eigenvalues of Schrödinger operator on three dimensional lattice. Methods of Functional Analysis and Topology, [S. l.], v. 28, n. 3, p. 189–208, 2022. DOI: https://doi.org/10.31392/MFAT-npu26_3.2022.01. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/832. Acesso em: 15 dec. 2025.