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Hosseiny Matikolai, S. 2011. 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, 1 (224) (Feb. 2011), 7–11. DOI:https://doi.org/10.46991/PYSU:A/2011.45.1.007.