Parsa, V., G. Singh, G. Chen, and K. Umapathy. “Objective and Subjective Evaluation of Noise Reduction Algorithms for Hearing Aids”. Canadian Acoustics, vol. 32, no. 3, Sept. 2004, pp. 72-73, https://jcaa.caa-aca.ca/index.php/jcaa/article/view/1633.