Banker, D D2001-11-072009-05-292001-11-072009-05-292001-11-07Banker DD. Smallpox vaccination--update. 1981. Indian Journal of Medical Sciences. 2001 Nov; 55(11): 621-5http://imsear.searo.who.int/handle/123456789/66370engHistory, 20th CenturyHumansSmallpox --historySmallpox Vaccine --adverse effectsVaccination --historyBiography