O’LOUGHLIN, Niall. Characterization in the Operas of Penderecki. Musicological Annual, Ljubljana, SI, v. 51, n. 2, p. 127–137, 2015. DOI: 10.4312/mz.51.2.127-137. Disponível em: https://journals.uni-lj.si/MuzikoloskiZbornik/article/view/3505.. Acesso em: 19 may. 2024.