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ON THE DISCRETENESS OF THE SPECTRUM OF MATRIX SCHRÖDINGER AND DIRAC OPERATORS WITH POINT INTERACTIONS ArticleBudyka V.S., Malamud M.M.Mathematical Notes. Том 110. 2021. С. 960-966
SELF-ADJOINTNESS AND DISCRETENESS OF THE SPECTRUM OF BLOCK JACOBI MATRICES ArticleBudyka V.S., Malamud M.M.Mathematical Notes. Том 108. 2020. С. 445-450
