Uffmann, Christian. “London Calling (or cooling?): Feature Theory, Phonetic Variation, and Phonological Change”. Yearbook of the Poznan Linguistic Meeting 7, no. 1 (September 25, 2021): 181–215. Accessed December 1, 2022. https://pressto.amu.edu.pl/index.php/yplm/article/view/29444.