Igarashi, R, et al. “Immunofluorescence Studies on Complement Components in the Hair Follicles of Normal Scalp and of Scalp Affected by Alopecia Areata”. Acta Dermato-Venereologica, vol. 61, no. 2, Mar. 1981, pp. 131-5, doi:10.2340/0001555561131135.