[1] |
V. Vazov, Asymptotic Expansions of Solutions of Ordinary Differential Equations [Russian translation], Mir, Moscow (1969). |
[2] |
W. Wasow, ?Simplification of turning point problems for systems of linear differential equations,? Trans. Amer. Math. Soc.,106, 100-114 (1963). · Zbl 0109.31003 · doi:10.1090/S0002-9947-1963-0142836-2 |
[3] |
G. D’Angelo, Linear Systems with Variable Parameters [Russian translation], Mashinostroenie, Moscow (1974). |
[4] |
S. F. Feshchenko, N. I. Shkit’, and L. D. Nikolenko, Asymptotic Methods in the Theory of Linear Differential Equations [in Russian], Naukova Dumka, Kiev (1966). |
[5] |
S. F. Feshchenko and N. I. Shkil’, ?Asymptotic solutions of special systems of linear differential equations,? Dopov. Akad. Nauk UkrRSR, No. 5, 482-485 (1958). |
[6] |
S. F. Feshchenko and N. I. Shkil’, ?Asymptotic solutions of systems of linear differential equations with a small parameter in the derivative,? Ukr. Mat. Zh.,12, No. 4, 429-438 (1960). · Zbl 0114.29001 · doi:10.1007/BF02528057 |
[7] |
N. I. Shkil’, ?Systems of linear differential equations with a small parameter ia some of the derivatives,? Differents. Uravneniya,1, No. 7, 868-879 (1965). |
[8] |
N. I. Shkil’, ?On some asymptotic methods in the theory of linear differential equations with slowly varying coefficients,? Author’s Abstract of Candidate’s Dissertation. Kiev (1968). |
[9] |
I. I. Starun, ?On the asymptotic behavior of solutions of systems of linear differential equations,? Author’s Abstract of Candidate’s Dissertation, Kiev (1969). |
[10] |
N. I. Shkil’, Asymptotic Methods in Differential Equations [in Russian], Vishcha Shkola, Kiev (1971). |