Veloso, João. “Central, Epenthetic, Unmarked Vowels and Schwas: A Brief Outline of Some Essential Differences”. Linguística: Revista de Estudos Linguísticos da Universidade do Porto 5 (July 19, 2017). Accessed October 2, 2026. https://ojstest.xyz/ojsletrasX/index.php/EL/article/view/193-214.