Nikiforov, Andrey, and Polina Kushnir. “ENERGY SAVING. PIEZOGENERATORS”. HUMAN. ENVIRONMENT. TECHNOLOGY. Proceedings of the Students International Scientific and Practical Conference, no. 22 (April 25, 2018): 43–49. Accessed April 7, 2025. https://journals23.rta.lv/index.php/HET/article/view/3638.