Extreme events in a class of nonlinear Duffing-type oscillators with a parametric periodic force Dan Zhao, Yongge Li, Yong Xu, Qi Liu and Jürgen Kurths Eur. Phys. J. Plus, 137 3 (2022) 314 Published online: 07 March 2022 DOI: 10.1140/epjp/s13360-022-02530-z