TY  - JOUR
AU  - V. V. Yevstafyeva
TI  - On necessary conditions for existence of periodic solutions in a~dynamic system with discontinuous nonlinearity and an external periodic influence
JO  - Ufa mathematical journal
PY  - 2011
SP  - 19
EP  - 26
VL  - 3
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/UFA_2011_3_2_a2/
LA  - en
ID  - UFA_2011_3_2_a2
ER  -