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\bibitem{Ghorbani_etal2021} {\textquotedblleft}\textit{An attempt to develop ecotourism in an unknown area : the case of Nehbandan County, South Khorasan Province, Iran}{\textquotedblright}. Ghorbani A, Mousazadeh H, Taheri F, Ehteshammajd S, Azadi H, Yazdanpanah M, Khajehshahkohi A, Tanaskovik V, Van Passel S, Environment, development and sustainability \textbf{23}, 11792 (2021).   http://doi.org/10.1007/S10668-020-01142-W

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