Wilhite D, Drought a Global Assessment Vols. 1 and 2. NewYork USA: 2000.
 Mishra A.K, Singh V.P. A review drought concepts. Journal of Hydrology.2010; 391(1): 202-216.
 Habibi A. Applied Safety and Performance Indicators of Industry.1 nd. Tehran Tech Publications: 2004.
 Chu P.S, Nash A.J, Porter F.Y. Diagnostic studies of two contrasting rainfall episodes in Hawaii: Dry 1981 and wet 1982. Journal of climate. 1993; 6 (7): 1457-1462.
 Chu T.W, Shirmohammadi A, Montas H, Sadeghi A. Evaluation of the SWAT model's sediment and nutrient component in the Piedmont Physiographic Region of Maryland. American Society of Agricultural Engineers. 2004; 47:1523-1538.
 Jamshidi h, Khalili A, Kamkar A, Zandeparsa sh. Check and compare the indicators of drought spi and RDI at the Stations of the selected country. The second national conference on the effects of drought and strategies to manage it. Research center of Agriculture and Natural Resources, Isfahan, Iran: 2009.
 Behbahani M. Agricultura of drought risk management for wheat. third conference of Iran Water Resources Management: 2008.
 Khalili D, Farnoud T, Jamshidi H, KamgarHaghighi AA, Zand-Parsa S. Comparability analyses of the SPI and RDI meteorological drought indices in different climatic zones. Water Resour Manage. 2011; 25 (2):1737–1757.
 Zandiyalak H, Bustani F. Evaluation of the Agricultural Drought Period in Fars province using RDI Index. Journal of Water Resources Engineering.2015; 7 (3): 200-214.
 Aghayan a, Kamali Gh, Hojaam S. Quantitative risk assessment of agricultural drought in several climates of the country. Clinical Research Journal.2016; 6 (21): 150 – 164.
 Hosseini B, Dein pazhoh S, Nikbakht j. Analysis of drought in the north west of Iran with this technique the exploration of drought. Journal of soil and water.2015; 29 (2): 295-310.
 Mosaedi A, Mohammadi moghadam S, Kavakebi gh. Determine the characteristics of drought based on the index identified drought, RDI, and review its changes in the regions and different time periods. Journal of research of soil and water conservation. 2016; 23 (6): 140-154.
 Tsakiris, G, Pangalou D, Vangelis H. Establishing a drought index incorporating evaportranspiration. European Water. 2005; 9 (10): 3-11
 Tigkas D, Vangelis H, Tsakiris G, Drought and climate change impact on streamflow. Science total. 2012; 440: 33-41.
 PashiardisS,MicHaelidesS. mplementation of the standardized precipitation index (SPI) and thereconnaissance drought index (RDI) for regional drought assessment: A case study for Cyprus. European Water. 2012; 23:57-65.
 Vinit K, Rajendra P, Manoj K, Byun H. Comparison of drought indices for appraisal of drought characteristics. Ken. 2015.
 Semi-detailed hydrogeological studies of Khorramabad plain aquifers. Lorestan Regional Water Company. 2003.
 Lashkarei H. Pattern synoptic of the rain extreme south west of iran. Ph. D. thesis. university of Tarbiat modarres. 1997.
 Demirel M. C, Venancio A, Kahya E. Flow forecast by SWAT model and ANN in Pracana basin Portugal. Advances in Engineering Software. 2009; 40, 467–473.
 Neitsch S.L, Arnold J.G, Kiniry J.R, Williams J.R, King K.W.SWAT theoretical documentation. Blackland Research Center, Texas AgriLife Research, Texas Water Resources Institute Technical Report No.2011; 406 - 618.
 Reconnaissance Drought Index (RDI). Water Resources Management.2008; 21: 821-833.
 Doorenbos j, Kasam A. Yeld response to water. FAO Irrigation and Drainage Papers. 1979; No 33.
 Tsakiris G, Vangelis H. Establishing a droughtindex incorporating evaportranspiration. European Water.2005; 9 (10): 3-11.
 Mahdavei m, Dastoranei J, Statistical methods in water resources. Publications of University of Tehran.2016.
 Lawson M, Reiss A, Phillips R, Livingston K. Nebraska droughts. A study of their past chronological and spatial extent with implications for the future. 1979.