↑ Travers, Paul, et al. Janeway's immunobiology. Garland Science, 2008.
1 2 Hammarlund, Erika, et al. "Duration of antiviral immunity after smallpox vaccination." Nature medicine 9.9 (2003): 1131.
↑ Sprent, Jonathan, and Susan R. Webb. "Intrathymic and extrathymic clonal deletion of T cells." Current opinion in immunology 7.2 (1995): 196-205.
↑ Crotty, Shane, et al. "Cutting edge: long-term B cell memory in humans after smallpox vaccination." The Journal of Immunology 171.10 (2003): 4969-4973.
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