Hosseiny Matikolai, S.A. “ON THE ANISOTROPIC BOUNDARY VALUE PROBLEM, CONNECTED WITH HELMHOLTZE-SCHRÖDINGER ЕQUATION, UNDER THE BOUNDARY CONDITIONS OF THE FIRST AND SECOND TYPE”. Proceedings of the YSU A: Physical and Mathematical Sciences 45, no. 1 (224) (February 16, 2011): 7–11. Accessed November 23, 2024. https://journals.ysu.am/index.php/proceedings-phys-math/article/view/vol45_no1_2011_pp007-011.