Yu, J.G., B. Zhang, J.E. Lefebvre, and CH. Zhang. “Wave Propagation in Functionally Graded Piezoelectric Rods With Rectangular Cross-Section”. Archives of Mechanics 67, no. 3 (June 1, 2015): 213–231. Accessed January 17, 2026. http://am.ippt.gov.pl/index.php/am/article/view/v67p213.