Bordini, Carlos Alberto, and Hilton Mariano da Silva Junior. “Cephalalgia Heterotopica: A Case Series of Extratrigeminal Cluster Headache”. Headache Medicine 13, no. Supplement (October 27, 2022): 33. Accessed January 19, 2025. https://www.headachemedicine.com.br/index.php/hm/article/view/703.