TY  - JOUR
AU  - Yu. G. Bulychev
TI  - A general theory of approximate methods for constructing parametrized solutions of linear differential equations
JO  - Differencialʹnye uravneniâ
PY  - 1998
SP  - 395
EP  - 402
VL  - 34
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1998_34_3_a15/
LA  - ru
ID  - DE_1998_34_3_a15
ER  -