Martínez, J.A. Fernández, E. Maseda Álvarez, A. Martínez Ferreras, and A. Lede Barreiro. 2013. “Silent Sinus Syndrome: An Unsuspected Cause of Palpebral Retraction”. Portuguese Journal of Otorhinolaryngology and Head and Neck Surgery 51 (3):201-4. https://doi.org/10.34631/sporl.70.