Löwhagen, GB., JE. Brorson, and B. Kaijser. “Penicillin Concentrations in Cerebrospinal Fluid and Serum After Intramuscular, Intravenous, and Oral Administration to Syphilitic Patients”. Acta Dermato-Venereologica 63, no. 1 (January 1, 1983): 53–57. Accessed June 2, 2026. https://medicaljournalssweden.se/actadv/article/view/7845.