TY  - JOUR
AU  - E. F. Mishchenko
AU  - L. S. Pontryagin
TI  - A proof of some asymptotic formulas for solutions of differential equations involving a small parameter
JO  - Doklady Akademii Nauk
PY  - 1958
SP  - 967
EP  - 969
VL  - 120
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1958_120_5_a9/
LA  - ru
ID  - DAN_1958_120_5_a9
ER  -