@article{
  author = {Jahangir, Mohammad Hossein, Saranirad, Mohammad},
  title = {Evaluation of drought in South Khorasan province (Iran) using normal precipitation index (PNPI) and standardized method index (Z)},
  journal = {Journal of Environmental Science and Technology},
  year = {2019},
  volume = {21},
  issue = {4},
  pages = {45-59},
  doi = {10.22034/jest.2019.14562},
  url = {https://sanad.iau.ir/fa/Article/839197}
}