Amorim, Humberto, Ricardo Dias, and Paulo Martelli. “Two Unpublished Transcriptions by Sérgio Abreu: Procedures, Contexts and Criteria for Diplomatic Editions”. Vortex Music Journal 11, no. 2 (October 12, 2023): 1–46. Accessed October 12, 2026. https://periodicos-hml.unespar.edu.br/vortex/article/view/8359.