Reinholt Petersen, Niels. “Variation in Inherent Fo Level Differences Between Vowels As a Function of Position in the Utterance and in the Stress Group ”. Annual Report of the Institute of Phonetics University of Copenhagen 13 (March 19, 1979): 27–57. Accessed May 6, 2024. https://tidsskrift.dk/ARIPUC/article/view/131714.