BECKER, Heinz. Zur Situation der Opernforschung . Die Musikforschung, [S. l.], v. 27, n. 2, p. 153–165, 1974. DOI: 10.52412/mf.1974.H2.1968. Disponível em: https://mf.journals.qucosa.de/mf/article/view/1968. Acesso em: 14 mai. 2025.