Method of Similar Operators in the Study of Spectral Properties of Perturbed First-Order Differential Operators - Baskakov, A. G.; Krishtal, I. A.; Uskova, N. B. (Journal of mathematical sciences (New York, N.Y.), 2022)
Keywords: Boundary conditions; Differential equations; Hilbert space; Mathematics; Mathematics and Statistics; Operators (mathematics); 37K35; spectrum; 35Q53; method of similar operators; 37K10; integro-differential operator; 35L75