Chaotic dynamics of a parametrically modulated Josephson junction with quadratic damping F. Li, B. J. Zhou, W. X. Shu, H. L. Luo, Z. Y. Huang and L. Tian Eur. Phys. J. D, 50 1 (2008) 75-80 Published online: 30 October 2008 DOI: 10.1140/epjd/e2008-00201-5