TY  - BOOK
AU  - Feschenko, S.F.
AU  - Shkil, N.I.
AU  - Nikolenko, L.D.
TI  - Asympotitic methods in the theory of linear differential equations
T2  - Modern Analytic & Computational Methods in Science and Maths
U1  - 515.35 
PY  - 1967///
CY  - New York
PB  - American Elsevier Publishing Company
ER  -