Kunzel, Hermann J. “Beware of the ‘telephone effect’: The Influence of Telephone Transmission on the Measurement of Formant Frequencies”.
International Journal of Speech, Language and the Law 8, no. 1 (February 28, 2001): 80–99. Accessed April 18, 2025.
https://journal.equinoxpub.com/IJSLL/article/view/9907.