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\bibitem{Joolaie_etal2017} {\textquotedblleft}\textit{Sustainable cropping pattern in North Iran : application of fuzzy goal programming}{\textquotedblright}. Joolaie R, Sarvestani AA, Taheri F, Van Passel S, Azadi H, Environment, development and sustainability \textbf{19}, 2199 (2017).   http://doi.org/10.1007/S10668-016-9849-9

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