Yuanyuan, Fan, Sang Yingjun, Li Man, Wu Shangguang, Ding Zujun, Wang Yeqin, and Hao Yunrong. 2016. “Modeling and Experimental Verification of an Electromagnetic and Piezoelectric Hybrid Energy Harvester”. Journal of Engineering and Technological Sciences 48 (5):614-30. https://doi.org/10.5614/j.eng.technol.sci.2016.48.5.8.