Mahmud, Md. Amin, Md. Shahriar Islam, Md. Zahid Hossain, and Mir Md. Maruf Morshed. 2016. “A Comparative Study Between Different Helmholtz Resonator Systems”. Canadian Acoustics 44 (4):12-17. https://jcaa.caa-aca.ca/index.php/jcaa/article/view/2866.