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\bibitem{Sharafi_etal2020} {\textquotedblleft}\textit{Drought risk assessment: Towards drought early warning system and sustainable environment in western Iran}{\textquotedblright}. Sharafi L, Zarafshani K, Keshavarz M, Azadi H, Van Passel S, Ecological Indicators \textbf{114}, 106276 (2020).   http://doi.org/10.1016/j.ecolind.2020.106276

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