TY  - JOUR
AU  - Jaume Llibre
AU  - Marco Antonio Teixeira
TI  - Periodic solutions of discontinuous second order differential systems
JO  - Journal of Singularities
PY  - 2014
SP  - 183
EP  - 190
VL  - 10
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.5427/jsing.2014.10l/
DO  - 10.5427/jsing.2014.10l
ID  - 10_5427_jsing_2014_10l
ER  -