Miaorong Zhang Xiaofang Zhang Qinsheng Bi Slow-Fast Behaviors and Their Mechanism in a Periodically Excited Dynamical System with Double Hopf Bifurcations. 2130022:1-2130022:15 2021 31 Int. J. Bifurc. Chaos 8 https://doi.org/10.1142/S0218127421300226 db/journals/ijbc/ijbc31.html#ZhangZB21