TY  - JOUR
AU  - N. N. Krasovskii
TI  - On periodical solutions of differential equations involving a time lag
JO  - Doklady Akademii Nauk
PY  - 1957
SP  - 252
EP  - 255
VL  - 114
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1957_114_2_a4/
LA  - ru
ID  - DAN_1957_114_2_a4
ER  -