HAVELOCK, D. I.; BRAMMER, A. J. Localized sound reproduction using a directional source array. Canadian Acoustics, [S. l.], v. 27, n. 3, p. 64–65, 1999. Disponível em: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/1220. Acesso em: 28 mar. 2024.