Review
The origins of vaccinia virus.
J. Infect. Dis. 1977 Sep 1; 136 (3): 453-5.
Letter
An Early American Smallpox Vaccine Based on Horsepox.
N. Engl. J. Med. 2017 Oct 12; 377 (15): 1491-1492.
Historical Article
[History of smallpox vaccination in Romania and source of the IC strains of vaccinia virus].
Rev Ig Bacteriol Virusol Parazitol Epidemiol Pneumoftiziol Bacteriol Virusol Parazitol Epidemiol. 1979 Oct 1; 24 (4): 247-52.