DING, Hongwei, Oliver JOKISCH, and Rüdiger HOFFMANN. “Perception and Analysis of Chinese Accented German Vowels”. Archives of Acoustics 32, no. 1 (March 31, 2007): 89–100. Accessed March 4, 2026. https://acoustics.ippt.gov.pl/index.php/aa/article/view/768.