Fariba Esfandiary and  Ghafoor Aghaie and  Ali Dolati Mehr,  Wheat Yield Prediction through Agro Meteorological Indices for Ardebil District.   journal   = {International Journal of Agricultural and Biosystems Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2009, vol. 25(1). 18 - 21
    [viewed 02 April 2020]. Available from: https://publications.waset.org/pdf/5877.