DING, Hongwei; HOFFMANN, Rudiger; JOKISCH, Oliver. An Investigation of Tone Perception and Production in German Learners of Mandarin. Archives of Acoustics, [S. l.], v. 36, n. 3, p. 509–518, 2013. Disponível em: https://acoustics3.ippt.pan.pl/index.php/aa/article/view/161. Acesso em: 26 apr. 2025.