TY  - JOUR
AU  - Urbina, A.M.
TI  - Limit Cycles of Liénard Equations With Non Linear Damping
JO  - Canadian mathematical bulletin
PY  - 1993
SP  - 251
EP  - 256
VL  - 36
IS  - 2
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1993-036-x/
DO  - 10.4153/CMB-1993-036-x
ID  - 10_4153_CMB_1993_036_x
ER  -