Abbasian M, Abrishamchi A (2014) Comparison of multivariate with univariate analysis for drought event using copula functions. 9th National Congress of Civil Engineering, Noshirvani University of Babol (In Persian)
Abdi A, Hassanzadeh Y, Talatahari S, Fakheri-Fard A, Mirabbasi R (2016) Regional bivariate modeling of droughts using L-components and copulas. Environmental Research and Risk Assessment 31(5):1199-1210. DOI: 10.1007/s00477-016-1222-x
Amirataee B, Montaseri M, Rezaie H (2018) Regional analysis and derivation of copula-based drought Severity-Area Frequency curve in Lake Urmia basin, Iran. Journal of Environmental Management 206:134-144 (In Persian)
Ayantobo OO, Li Y, Song S (2019) Copula-based trivariate drought frequency analysis approach in seven climatic sub-regions of mainland China over 1961–2013. Theoretical and Applied Climatology 137:2217- 2237
Ayantobo OO, Li Y, Song S, Javed T, Yao N (2018) Probabilistic modelling of drought events in China via2-dimensional joint copula. Journal of Hydrology 559:373-391
De Michele C, Salvadori G (2003) A Generalized Pareto intensity-duration model of storm rainfall exploiting 2-copulas. Journal of Geophysical Research 108(D2):4067
Ramezani Y, Nazeri Tahroudi M (2020) Improving the performance of the SPEI using four- parameter distribution function. Theoretical and Applied Climatology 139:1151–1162
Salvadori G, De Michele C (2006) Statistical characterization of temporal structure of storms. Advances in Water Resources 29(6):827–842
Ekanayake E, Perera K (2014) Analysis of drought severity and duration using copulas in Anuradhapura, Sri Lanka. British Journal of Environment and Climate Change 4(3):312-327
Fang HB, Fang KT, Kotz S (2002) The meta-elliptical distributions with given marginals. Journal of Multivariate Analysis 82:1-16
Ghabaei Sough M, Zare Abyaneh H, Mosaedi A (2017) Development of ADI as a aggregate drought index based on principle component analysis for monitoring agricultural drought in Golestan Province- Iran. Iran-Water Resources Research 13(2):56-73 (In Persian)
Goodarzi M, Fatehifar A, Avazpoor F (2019) Bivariate analysis of the impact of climate change on drought with SPEI index and Coppola functions (Case study: Dugonbadan). Iran-Water Resources Research 15(4):352-365 (In Persian)
Hui-Mean F, Yusof F, Yusop Z, Suhaila J (2019) Trivariate copula in drought analysis: a case study in peninsular Malaysia. Theoretical and Applied Climatology 138:657-671
Javizadeh S, Hejazizadeh Z (2019) Analysis of drought spatial statistics in Iran. Researches in Geographical Sciences 19(53):251-277
Joe H (1997) Multivariate models, dependence concepts. London: Chapman & Hall, 399 pp.
Kao SC, Govindaraju RS (2010) A copula-based joint deficit index for droughts. Journal of Hydrology 380:121-134
Mirabbasi R, Fakheri-Fard A, Dinpazhoh Y (2012) Bivariate drought frequency analysis using the copula method. Theoretical and Applied Climatology 108(1-2):191-206
Nelsen RB (2006) An introduction to Copulas. Springer, New York, 269 pp.
Sadri S, Burn DH (2012) Nonparametric methods for drought severity estimation at ungauged sites. Water Resources Research 48:W12505
Saeidipour M, Radmanesh F, Eslamian S (2019) Meteorological drought monitoring using the multivariate index of SPEI (Case study: Karun Basin). AUT Journal of Civil Engineering 3(1):85-92
Shiau JT (2006) Fitting drought duration and severity with two-dimensional copulas. Water Resources Management 20:795–815
Sklar A (1959) Fonctions de répartition à n dimensions et leurs marges. Publications de l'Institut de Statistique de L'Université de Paris 8:229-231
Song S, Singh VP (2010) Meta-elliptical copulas for drought frequency analysis of periodic hydrologic data. Environmental Research and Risk Assessment 24:425–444
Thilakarathne M, Sridhar V (2018) Characterization of future drought conditions in the Lower Mekong River Basin. Weather and Climate Extremes 17:47-58
Van de Vyver H, Van den Bergh J (2018) The Gaussian copula model for the joint deficit index for droughts. Journal of Hydrology 561:987-999
Wong G, van Lanen HAJ, Torfs PJJF (2013) Probabilistic analysis of hydrological drought characteristics using meteorological drought. Hydrological Science Journal 58(2):253-270
Wong G, Lambert MF, Leonard M, Metcalfe AV (2010) Drought analysis using trivariate copulas conditional on climatic states. Journal of Hydrologic Engineering 15(2):129-141
Yang J, Chang J, Wang Y, Li Y, Hu H, Chen Y, Huang Q, Yao J (2018) Comprehensive drought characteristics analysis based on a nonlinear multivariate drought index. Journal of Hydrology 557:651-667