R&D COMPANY, Optel sp. z o.o. Ultrasonic Transducers with a very short impulse response. Archives of Acoustics, [S. l.], v. 23, n. 1, p. 149–150, 1998. Disponível em: http://acoustics.ippt.gov.pl/index.php/aa/article/view/901. Acesso em: 18 apr. 2026.