ARABYAN, M. H. ON AN EIGENVALUE PROBLEM. Proceedings of the YSU A: Physical and Mathematical Sciences, Yerevan, Armenia, v. 39, n. 3 (208), p. 31–39, 2005. DOI: 10.46991/PYSU:A/2005.39.3.031. Disponível em: https://journals.ysu.am/index.php/proceedings-phys-math/article/view/vol39_no3_2005_pp031-039. Acesso em: 22 jul. 2024.