de Oliveira, Rafael Alves. “The Explicit Instruction and Its Effects in Production and Perception of Brazilian Portuguese Anterior Fricatives by Latin-American Spanish Speakers”. MATRAGA - Journal published by the Graduate Program in Letters at Rio de Janeiro State University (UERJ) 25, no. 44 (August 30, 2018): 348–369. Accessed July 27, 2025. https://www.e-publicacoes.uerj.br/matraga/article/view/33838.