Izzat, N.N., J.M. Knox, W.G. Dacres, and E.B. Smith. “Resistance and Serological Changes in Rabbits Immunized With Virulent Treponema Pallidum Sonicate”. Acta Dermato-Venereologica 51, no. 2 (February 1, 1971): 157–160. Accessed June 27, 2026. https://medicaljournalssweden.se/actadv/article/view/3711.