WASET
    José E. Q. Souza and  Marcio Fontana and  Antonio C. C. Lima,  Piezoelectric Micro-generator Characterization for Energy Harvesting Application.   journal   = {International Journal of Energy and Environmental Engineering}, [online]. World Academy of Science, Engineering and Technology.
    June 2018, vol. 140(8). 527 - 532
    [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/10009350.