TY  - BOOK
AU  - Feshchenko,S.F., Shkil, N.I.
AU  - x
TI  - Asymptotic methods in the theory of linear differential equations: x
SN  - x
U1  - 517.37/FEA 
PY  - 1967///
CY  - N.Y.
PB  - Elsevier
KW  - Calculus
N1  - x
ER  -