CVETKO, Dragotin. From the Correspondence of Slavko Osterc. Musicological Annual, Ljubljana, SI, v. 11, n. 1, p. 82–92, 1975. DOI: 10.4312/mz.11.1.82-92. Disponível em: https://journals.uni-lj.si/MuzikoloskiZbornik/article/view/5034.. Acesso em: 15 apr. 2024.