Casulleras, Josep. “Julio Samsó, On both Sides of the Strait of Gibraltar. Studies in the History of Medieval Astronomy in the Iberian Peninsula and the Maghrib”. Suhayl. International Journal for the History of the Exact and Natural Sciences in Islamic Civilisation, pp. 289-10, https://raco.cat/index.php/Suhayl/article/view/409673.