FREEMAN, R. Darmstadt 1986. Contact: A Journal for Contemporary Music (1971-1990), [S. l.], n. 31, 1987. DOI: 10.25602/GOLD.cj.v0i31.1282. Disponível em: https://bjmh.gold.ac.uk/index.php/contactjournal/article/view/contactjournal31_p35-38. Acesso em: 23 may. 2024.