TY  - JOUR
AU  - V. N. Karp
TI  - The existence and uniqueness of a periodic solution of a non-linear problem concerning the forced vibrations of a string
JO  - Doklady Akademii Nauk
PY  - 1960
SP  - 515
EP  - 518
VL  - 133
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1960_133_3_a3/
LA  - ru
ID  - DAN_1960_133_3_a3
ER  -