GH. POURTAGHI; F. VALIPOUR; H. MOKARAMI; R. ATAEIFARID. Alternations in Helmholtz resonator neck angle and the shape of its connection to the air channels to increase the insertion loss of sound. Scientific Journal of Pure and Applied Sciences, [S. l.], v. 4, n. 11, p. 229-236, 2015. Disponível em: http://www.sjournals.com/index.php/sjpas/article/view/273. Acesso em: 21 jan. 2022.