Foti, C., and E. Bonifazi. “Allergic Contact Dermatitis to Topical Excipients of Propranolol”. European Journal of Pediatric Dermatology, vol. 24, no. 2, June 2014, pp. 122-3, https://ejpd.migration.pkpps03.publicknowledgeproject.org/index.php/journal/article/view/1015.