@article{paperid:1036451,
author = {Afsharnejad, Zahra and Majid Karimi Amale},
title = {extension of chicone s method for perturbation systems of three parameters with application to Lienard system},
journal = {International Journal of Bifurcation and Chaos},
year = {2012},
volume = {22},
number = {3},
month = {March},
issn = {0218-1274},
pages = {1--9},
			numpages = {8},
keywords = {periodic solution; perturbation; Lienard system},
}