[1] |
S. F. Feshchenko, N. I. Shkil’, and L. D. Nikolenko, Asymptotic Methods in the Theory of Linear Differential Equatious [in Russian], Naukova Dumka, Kiev (1966). |
[2] |
Yu. L. Daletskii, ?On certain equations with closed operators,? Izv. Kiev. Politekhn. In-ta,19, 157-177 (1956). |
[3] |
T. Kato, Perturbation Theory of Linear Operators [in Russian], Mir, Moscow (1972). · Zbl 0247.47009 |
[4] |
M. M. Vainberg and V. A. Trenogin, Branching Theory for Solutions of Nonlinear Equations [in Russian], Nauka, Moscow (1969). · Zbl 0274.47033 |
[5] |
N. I. Shkil’, ?On some asymptotic methods in the theory of linear differential equations with slowly varying coefficients,? Author’s Abstract of Doctoral Dissertation, Kiev. |
[6] |
Yu. L. Daletskii and M. G. Krein, The Stability of Solutions of Differential Equations in a Banach Space [in Russian], Nauka, Moscow (1970). |
[7] |
A. F. Turbin, ?A method of the theory of spectrally perturbed linear operators in asymptotic problems of the theory of probability,? Author’s Abstract of Candidate’s Dissertation, Kiev (1971). |
[8] |
Ya. D. Plotkin and A. F. Turbin, ?The inversion of normally solvable linear operators,? Ukr. Mat. Zh.,27, No. 4, 477-487 (1975). · Zbl 0311.34076 · doi:10.1007/BF01089995 |