TY  - JOUR
AU  - È. I. Grudo
TI  - On an analytic theory of systems of linear differential equations with an irregular singular point
JO  - Differencialʹnye uravneniâ
PY  - 1965
SP  - 318
EP  - 326
VL  - 1
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1965_1_3_a4/
LA  - ru
ID  - DE_1965_1_3_a4
ER  -