Gao, Zhiyan, and Steven Weinberger. “Which Phonetic Features Should Pronunciation Instructions Focus On? An Evaluation on the Accentedness of Segmental/Syllable Errors in L2 Speech”. Research in Language 16, no. 2 (June 30, 2018): 135–154. Accessed April 26, 2024. https://czasopisma.uni.lodz.pl/research/article/view/8060.