TY  - JOUR
AU  - A. G. Eliseev
TI  - Singular perturbation theory for systems of differential equations in the case of multiple spectrum of the limit operator.~I,~II
JO  - Izvestiya. Mathematics 
PY  - 1985
SP  - 315
EP  - 357
VL  - 25
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/IM2_1985_25_2_a3/
LA  - en
ID  - IM2_1985_25_2_a3
ER  -