Asbrink, E, and A. Hovmark. “Serum IgE Levels in Patients With Bullous Pemphigoid and Its Correlation to the Activity of the Disease and Anti-Basement Membrane Zone Antibodies”. Acta Dermato-Venereologica, vol. 64, no. 3, May 1984, pp. 243-6, doi:10.2340/0001555564243246.