Garofalo, L., I. Zalaudek, R. Happle, and E. Bonifazi. “Unilaterally Clustered Facial Melanocytic Nevi in Either of Dizygotic Twins.”. European Journal of Pediatric Dermatology, vol. 20, no. 2, June 2010, pp. 115 -19, https://ejpd.com/index.php/journal/article/view/673.