Garofalo, L., I. Zalaudek, R. Happle, and E. Bonifazi. 2010. “Unilaterally Clustered Facial Melanocytic Nevi in Either of Dizygotic Twins.”. European Journal of Pediatric Dermatology 20 (2):115 -19. https://ejpd.com/index.php/journal/article/view/673.