TY  - JOUR
AU  - A. N. Erugin
TI  - Certain analytic singularities in the solution of a differential equation in the case of a focus
JO  - Differencialʹnye uravneniâ
PY  - 1968
SP  - 423
EP  - 428
VL  - 4
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1968_4_3_a3/
LA  - ru
ID  - DE_1968_4_3_a3
ER  -