Gh. Pourtaghi, F. Valipour, H. Mokarami, and 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 4, no. 11 (November 25, 2015): 229-236. Accessed November 23, 2024. http://sjournals.com/index.php/sjpas/article/view/273.