CHIU, Min-Chie. “Noise Elimination of a Multi-Tone Broadband Noise With Hybrid Helmholtz Mufflers Using a Simulated Annealing Method”. Archives of Acoustics, vol. 37, no. 4, Oct. 2013, pp. 489–498, https://acoustics3.ippt.pan.pl/index.php/aa/article/view/78.