Taetrongchit, N., and P. Sinsawad. “Heterochromia iridis in acquired Horner syndrome secondary to spontaneous internal carotid artery dissection”. Journal of Medicine and Health Sciences, vol. 28, no. 1, Apr. 2021, pp. 132-9, https://he01.tci-thaijo.org/index.php/jmhs/article/view/249199.