Marinelli, I., and A. Vendemiati. “Erythema Nodosum After Immunization With Oral Polio Virus”. European Journal of Pediatric Dermatology, vol. 9, no. 4, Dec. 1999, pp. 197-8, https://ejpd.migration.pkpps03.publicknowledgeproject.org/index.php/journal/article/view/73.