Richard R, Heim Jr. A review of twentieth-century drought indices used in the United States[J]. Bull Amer Meteor Soc, 2002, 83(8): 1149-1165. 2.3.CO;2 target="_blank">
[21]
Wu H, Hayes M J, Wilhite D A, et al. The effect of the length of record on the standardized precipitation index calculation[J]. Int J Climatol, 2005, 25(4): 505-520.
[22]
Benjamin L H, Mark A S. A drought climatology for Europe[J]. Int J Climatol, 2002, 22(13): 1571-1592.
[23]
Wu H, Svoboda M D, Hayes M J, et al. Appropriate application of the standardized precipitation index in arid locations and dry seasons[J]. Int J Climatol, 2007, 27(1): 65-79.
[24]
Hayes M J, Svoboda M D, Wilhite D A, et al. Monitoring the 1996 drought using the standardized precipitation index[J]. Bull Amer Meteor Soc, 1999, 80(3): 429-438. 2.0.CO;2 target="_blank">
Palmer, W C. Meteorological drought[R]. U.S. Weather Bureau Research Paper, 1965, 45(1): 1-58.
[30]
Guttman N B. A sensitivity analysis of the Palmer Hydrological Drought Index[J]. Water Resour Bull, 1991, 27(5): 797-807.
[31]
Vicente-Serrano S M, Beguería S, López-Moreno J I. A multiscalar drought index sensitive to global warming: The standardized precipitation evapotranspiration index[J]. J Climate, 2010, 23(7): 1696-1718.
[32]
Singh V P, Guo H, Yu F X. Parameter estimation for 3-parameter log-logistic distribution(LLD3) by Pome[J]. Stochastic Hydrology and Hydraulics, 1993, 7(3): 163-177.