Barenten Suciu and  Yuya Nakamoto,  Evaluation of the Power Generation Effect Obtained by Inserting a Piezoelectric Sheet in the Backlash Clearance of a Circular Arc Helical Gear.   journal   = {International Journal of Mechanical and Mechatronics Engineering}, [online]. World Academy of Science, Engineering and Technology.
    August 2019, vol. 153(9). 634 - 640
    [viewed 15 December 2019]. Available from: https://publications.waset.org/pdf/10010787.