Pomero, Fulvio, Luca Dutto, Christian Bracco, Paola Cena, Remo Melchio, and Luigi M. Fenoglio. 2007. “Cephalea, Horner’s Syndrome and Cerebral Ischemia: Pathognomonic Triad”. Emergency Care Journal 3 (3):21-24. https://doi.org/10.4081/ecj.2007.3.21.