Singh, A D1968-06-162009-05-311968-06-162009-05-311968-06-16Singh AD. What is new in radiotherapy. Journal of the Indian Medical Association. 1968 Jun; 50(12): 567-71http://imsear.searo.who.int/handle/123456789/95876engHistory, 19th CenturyHistory, 20th CenturyRadiotherapy --historyHistorical Article