Pomero, F., Dutto, L., Bracco, C., Cena, P., Melchio, R. and Fenoglio, L.M. 2007. Cephalea, Horner’s syndrome and cerebral ischemia: pathognomonic triad. Emergency Care Journal. 3, 3 (Jun. 2007), 21–24. DOI:https://doi.org/10.4081/ecj.2007.3.21.