Calamassi, Diletta, Alessia Lucicesare, Gian Paolo Pomponi, and Stefano Bambi. “Music Tuned to 432 Hz Versus Music Tuned to 440 Hz for Improving Sleep in Patients With Spinal Cord Injuries: A Double-Blind Cross-over Pilot Study”. Acta Biomedica Atenei Parmensis 91, no. 12-S (November 30, 2020): e2020008. Accessed July 18, 2024. https://mattioli1885journals.com/index.php/actabiomedica/article/view/10755.