TY  - JOUR
AU  - B. N. Sadovskii
TI  - Application of topological methods in the theory of periodic solutions of nonlinear differential-operator equations of neutral type
JO  - Doklady Akademii Nauk
PY  - 1971
SP  - 1037
EP  - 1040
VL  - 200
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1971_200_5_a7/
LA  - ru
ID  - DAN_1971_200_5_a7
ER  -