ČERMÁK, V. Zu Beethovens Brief an die unsterbliche Geliebte (Psychologische und medizinische Aspekte). Musicological Annual, [S. l.], v. 13, n. 1, p. 44–50, 1977. DOI: 10.4312/mz.13.1.44-50. Disponível em: https://revije.ff.uni-lj.si/MuzikoloskiZbornik/article/view/5052. Acesso em: 21 jun. 2021.