Leimeister, Matthias, et al. “Simple Spectral Subtraction Method Enhances Speech Intelligibility in Noise for Cochlear Implant Listeners”. Proceedings of the International Symposium on Auditory and Audiological Research, vol. 5, Dec. 2015, pp. 325-32, https://proceedings.isaar.eu/index.php/isaarproc/article/view/2015-38.