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\bibitem{Zarafshani_etal2016} {\textquotedblleft}\textit{Vulnerability assessment models to drought : toward a conceptual framework}{\textquotedblright}. Zarafshani K, Sharafi L, Azadi H, Van Passel S, Sustainability \textbf{8}, 1 (2016).   http://doi.org/10.3390/SU8060588

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