Center or limit cycle: renormalization group as a probe A. Sarkar, J.K. Bhattacharjee, S. Chakraborty and D.B. Banerjee Eur. Phys. J. D, 64 2-3 (2011) 479-489 Published online: 17 August 2011 DOI: 10.1140/epjd/e2011-20060-1