TY  - BOOK
AU  - Feshchenko, S. F.
TI  - Asymptotic methods in the theory of linear differential equations
T2  - Modern analytic and computational methods in science and mathematics
U1  - 517.38 
PY  - 1967///
CY  - New York
PB  - American Elsevier
KW  - Ecuaciones diferenciales
ER  -