Li, Xinxin, Kexue Huang, Zhilin Li, Jiangshu Xiang, Zhenfeng Huang, Hanling Mao, and Yadong Cao. 2022. “Investigation to the Influence of Additional Magnets Positions on Four-Magnet Bi-Stable Piezoelectric Energy Harvester”. Bulletin of the Polish Academy of Sciences Technical Sciences 70 (1):e140151. https://doi.org/10.24425/bpasts.2022.140151.