Moumita Palchaudhuri and  Sujata Biswas,  Analysis of Meteorological Drought Using Standardized Precipitation Index –  A Case Study of Puruliya District, West Bengal, India.   journal   = {International Journal of Environmental and Ecological Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2013, vol. 75(3). 167 - 174
    [viewed 25 May 2022]. Available from: https://publications.waset.org/pdf/9996966.