He Q, Mao X, Chu D. Output Performance Analysis on a Two-degrees-of-Freedom Bistable Piezoelectric Vibration Generator. Int. J. Onl. Eng. [Internet]. 2015 Nov. 5 [cited 2024 May 2];11(6):pp. 22-27. Available from: https://online-journals.org/index.php/i-joe/article/view/5022