Gassmann, R, OB Engler, M Alex, CP Czerny, and M Mutsch. “Clinical and Immune Response to Undiluted and Diluted Smallpox Vaccine”. Swiss Medical Weekly 138, no. 2728 (July 12, 2008): 392–397. Accessed May 4, 2024. https://smw.ch/index.php/smw/article/view/872.