EMMERSON, S. Ring Modulation and Structure. Contact: A Journal for Contemporary Music (1971-1990), [S. l.], n. 17, 1977. DOI: 10.25602/GOLD.cj.v0i17.1076. Disponível em: https://journals.gold.ac.uk/index.php/contactjournal/article/view/contactjournal17_p14-20. Acesso em: 23 apr. 2024.