Zakaryan, M. A.; Tzutzulyan, A. V. THE FREDHOLM CRITERION AND INDEX CALCULATION OF TEOPLITS OPERATORS IN SOME HILBERT SPACES OF ANALYTIC FUNCTIONS. Proc. YSU A: Phys. Math. Sci. 2023, 42 (2 (216), 23-29. https://doi.org/10.46991/PYSUA.2008.42.2.023.