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[1]Αρχειοθετήθηκε 2015-08-06 στο Wayback Machine.«The History of Smallpox and Its Spread around the World». Accessed 28 Ιανουαρίου 2013.
«Smallpox». Armed Forces Institute of Pathology: Department of Infectious and Parasitic Diseases. Αρχειοθετήθηκε από το πρωτότυπο στις 9 Οκτωβρίου 2007. Ανακτήθηκε στις 28 Οκτωβρίου 2008.CS1 maint: Unfit url (link)
