NIKKILÄ, P. A Comparison of Low and Middle Level Tones in Cantonese with Tones in Mandarin Chinese. Studia Orientalia Electronica, [S. l.], v. 85, p. 407–412, 2014. Disponível em: https://journal.fi/store/article/view/45086. Acesso em: 26 apr. 2024.