(3) Koc, B, S. Alkoy, and K. Uchino, "A Circular Piezoelectric Transformer with Crescent Shape...
5
(3) Koc, B, S. Alkoy, and K. Uchino, "A Circular Piezoelectric Transformer with Crescent Shape Input Electrodes, IEEE Ultrasonic Symp. Proc, pp. 931-934 (1999)