Romiti, R., et al. “Child With Macular Hyperpigmentation, Nevus Flammeus, and Systemic Disorders: A Variant of Phakomatosis Pigmentovascularis?”. European Journal of Pediatric Dermatology, vol. 7, no. 2, June 1997, pp. 93-8, https://ejpd.migration.pkpps03.publicknowledgeproject.org/index.php/journal/article/view/23.