Shahnaz, C., W.-P. Zhu, and M. O. Ahmad. “A Cepstral-Domain Algorithm for Pitch Estimation from Noise-Corrupted Speech”. Canadian Acoustics, vol. 36, no. 3, Sept. 2008, pp. 80-81, https://jcaa.caa-aca.ca/index.php/jcaa/article/view/2047.