Arya, S C1992-07-012009-06-031992-07-012009-06-031992-07-01Arya SC. Vaccine stability in different environments, not at different temperatures. National Medical Journal of India. 1992 Jul-Aug; 5(4): 198http://imsear.searo.who.int/handle/123456789/119081engClimateDrug StabilityPoliovirus Vaccine, Oral --standardsTemperatureVaccine stability in different environments, not at different temperatures.Letter