Abolverdi J, Khalili D (2010) Probabilistic analysis of extreme regional meteorological droughts by L-moments, in a semi-arid environment. Theoretical and Applied Climatology 102:351-366
Agnew CT (2000) Using the SPI to identify drought. Drought Network News, University of Nebraska, Lincoln
Banimahd SA, Khalili D (2013) Factors influencing Markov Chains predictability characteristics, utilizing SPI, RDI, EDI and SPEI drought indices in different climatic zones. Water Resources Management 27(11):3911-3928
Gardiner JC, Luo Z, Roman LA (2009) Fixed effects, random effects and GEE: What are the differences. Statistics in Medicine 28(2):221-239
Guttman A, Wallis J, Hosking J (1992) Spatial comparability of Palmer Drought Severity Index. Water Resources Bulletin 28(6):1111-1119
Khalili D, Farnoud T, Jamshidi H, Kamgar-Haghighi AA, Zand-Parsa S (2011) Comparability analyses of the SPI and RDI meteorological drought indices in different climatic zones. Water Resources Management 25:1737-1757
Khalili N, Rezaee Pazhand H, Derakhshan H, Davary K (2019) Developing a framework for agricultural drought risk assessment for rainfed wheat. Iran-Water Resources Research 14(4):60-72 (In Persian)
McKee TB, Doesken NJ, Kleist J (1995) Drought monitoring with multiple time scales. Paper Presented at 9th Conference on Applied Climatology. American Meteorological Society, Dallas, Texas
Merabti A, Martins DS, Meddi M, Pereira LS (2018) Spatial and time variability of drought based on SPI and RDI with various time scales. Water Resources Management 32(3):1087-1100
Mousavi SM, Shokoohi A (2019) Effects of Kernel functions on SPEI and drought characteristics. Iran-Water Resources Research 15(2) (In Persian, Article in Press)
Palmer WC (1965) Meteorological droughts. U.S. Department of Commerce, Weather Bureau Research Paper 45, 58 pp.
Tsakiris G, Vangelis H (2005) Establishing a drought index incorporating evapotranspiration. European Water 9(10):3-11
Tabrizi AA, Khalili D, Kamgar-Haghighi AA, Zand-Parsa S (2010) Utilization of time-based eteorological droughts to investigate occurrence of streamflow droughts. Water Resources Management 24:4287-4306
Tsakiris G (2004) Meteorological drought assessment. Paper prepared for the needs of the European Research Program MEDROPLAN (Mediterranean Drought Preparedness and Mitigation Planning), Zaragoza, Spain
Vicente-Serrano SM, Beguería S, López-Moreno JI (2010) A multi-scalar drought index sensitive to global warming: The Standardized Precipitation Evapotranspiration Index–SPEI. Journal of Climate 23:1696-1718