Finding Limit Cycles in self-excited oscillators with infinite-series damping functions Debapriya Das, Dhruba Banerjee and Jayanta K. Bhattacharjee Eur. Phys. J. D, 69 3 (2015) 85 Published online: 24 March 2015 DOI: 10.1140/epjd/e2015-50457-5