BINDAL, V. N.; CHANDRA, Mukesh. An improved piezoelectric ceramic transducer for ultrasonic applications in air. Archives of Acoustics, [S. l.], v. 7, n. 3-4, p. 281–286, 2016. Disponível em: https://acoustics3.ippt.pan.pl/index.php/aa/article/view/3288. Acesso em: 28 apr. 2025.