Patrizi, A., I. Neri, S. Marzaduri, and R. Marini. “Maculae Ceruleae. A Report of Four Pediatric Cases.”. European Journal of Pediatric Dermatology, vol. 4, no. 4, May 2018, pp. 203-8, https://ejpd.com/index.php/journal/article/view/1682.