GYOVAI, Ágnes; HEVESI, T. M. THE CIRCLE SYMBOL IN MUSIC EDUCATION. Studia Universitatis Babeș-Bolyai Musica, [S. l.], v. 60, n. 2, p. 95–107, 2015. Disponível em: http://193.231.18.162/index.php/subbmusica/article/view/5098. Acesso em: 5 jul. 2024.