GOLANOWSKI, Jerzy; GUDRA, Tadeusz. Ultrasonic transducers using radial vibrations of a piezoelectric disk. Archives of Acoustics, [S. l.], v. 4, n. 3, p. 245–255, 1979. Disponível em: https://acoustics.ippt.gov.pl/index.php/aa/article/view/3380. Acesso em: 4 mar. 2026.