Ullman, S, P Halberg, and R. Nielsen. “Anti-Basement Membrane Antibodies in Sera from Patients Without Bullous Pemphigoid”. Acta Dermato-Venereologica 55, no. 4 (July 1, 1975): 305–308. Accessed May 27, 2026. https://medicaljournalssweden.se/actadv/article/view/17592.