PARSONS, M. Echo Piece at Muddusjarvi. Contact: A Journal for Contemporary Music (1971-1990), [S. l.], n. 16, 1977. DOI: 10.25602/GOLD.cj.v0i16.1063. Disponível em: https://gold-ojs-prod.gold-eprints.cdl.cosector.com/index.php/contactjournal/article/view/contactjournal16_p9-10. Acesso em: 4 aug. 2025.