“SOFT AND HARD PIEZOELECTRIC MATERIALS FOR THE CONSTRUCTION OF A PIEZOELECTRIC SONOTRODE MOTOR”. ELECTRICAL MACHINES, MATERIALS AND DRIVES — PRESENT AND TRENDS 21, no. 1 (February 9, 2026): 64–69. Accessed May 1, 2026. https://journal.iem.pub.ro/apme/article/view/1798.