%0 Journal Article %A E. M. Mukhamsdiev %A I. D. Nurov %A M. Sh. Khalilova %T Limiting cycles of piece-linear second order differential equations %J Ufa mathematical journal %D 2014 %P 80-89 %V 6 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/UFA_2014_6_1_a7/ %G en %F UFA_2014_6_1_a7