Counting limit cycles with the help of the renormalization group D. Das, D. Banerjee, J. K. Bhattacharjee and A. K. Mallik Eur. Phys. J. D, 61 2 (2011) 443-448 Published online: 10 November 2010 DOI: 10.1140/epjd/e2010-00281-6