SCHAEFER, Ronald P. Regression, Surface Constraints And The Acquisition Of Mid Vowels. Kansas Working Papers in Linguistics, [S. l.], v. 4, p. 79–98, 1979. DOI: 10.17161/KWPL.1808.666. Disponível em: https://journals.ku.edu/kwpl/article/view/17412.. Acesso em: 2 may. 2024.