Bifurcations and nonlinear dynamics of asymmetric tri-stable piezoelectric vibration energy harvesters. - Youcheng Zheng; Guangqing Wang; Qiangguo Zhu; Guangbo Li; Yuyang Zhou; Lugang Hou; Yifan Jiang (Commun. Nonlinear Sci. Numer. Simul., 2023)