000
00300nam a2200109 4500
008
160616s 000 0
245
_a
Asymptotic methods in the theory of linear differential equations
100
_a
Feshchenko, S.F
500
_a
B33,1:114 K7
942
_c
BK
_2
BK4430
080
_a
517.968 FES
999
_c
4430
_d
4430