A. K. Mishra and V. P. Singh, “A Review of Drought Concepts,” Journal of Hydrology, Vol. 391, No. 1-2, 2010, pp. 202-216. doi:10.1016/j.jhydrol.2010.07.012
 UNISDR: The United Nations Office for Disaster Reduction, “Impacts of Disasters Since the 1992 Rio de Janeiro Earth Summit,” 2012.
 IPCC, “Climate Change 2007: The Physical Science Basis,” In: S. Solomon, D. Qin, M. Manning, Z. Chen, M. Marquis, K. B. Averyt, M. Tignor and H. L. Miller, Eds., Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, Cambridge University Press, Cambridge, New York, 2007, p. 996.
 C. A. S. Cohelo and L. Goddard, “El Nino-Induced Tropical Droughts in Climate Change Projections,” Journal of Climate, Vol. 22, No. 23, 2009, pp. 6456-6476.
 J. L. Minetti, W. M. Vargas, A. G. Poblete, L. R. Acuna and G. Casagrande, “Non-linear Trends and Low Frequency Oscillations in Annual Precipitation Over Argentina and Chile,” Atmósfera, Vol. 16, 2003, pp. 119-135.
 O. C. Penalba and W. M. Vargas, “Interdecadal and Interannual Variations of Annual and Extreme Precipitation Over Central-Northeastern Argentina,” International Journal of Climatology, Vol. 24, No. 12, 2004, pp. 1565-1580. doi:10.1002/joc.1069
 V. R. Barros, M. E. Doyle and I. A. Camilloni, “Precipitation Trends in Southeastern South America: Relationship with ENSO Phases and with Low-Level Circulation,” Theoretical and Applied Climatology, Vol. 93, No. 1-2, 2008, pp. 19-33.
 J. A. Rivera, O. C. Penalba and M. L. Bettolli, “Inter-Annual and Inter-Decadal Variability of Dry Days in Argentina,” International Journal Of Climatology, Vol. 33, No. 4, 2012, pp. 834-842. doi:10.1002/joc.3472
 C. M. Krepper and G. V. Zucarelli, “Climatology of Water Excess and Shortages in the La Plata Basin,” Theoretical and Applied Climatology, Vol. 102, No. 1-2, 2012, pp. 13-27. doi:10.1007/s00704-009-0234-6
 U. Schneider, A. Becker, P. Finger, A. Meyer-Christoffer, B. Rudolf and M. Ziese, “GPCC Full Data Reanalysis Version 6.0 at 1.0°: Monthly Land-Surface Precipitation from Rain-Gauges Built on GTS-based and Historic Data,” 2011. doi:10.5676/DWD_GPCC/FD_M_V6_100
 S. C. Chou, J. F. Bustamante and J. L. Gomes, “Evaluation of Eta Model Seasonal Precipitation Forecasts over South America,” Nonlinear Processes in Geophysics, Vol. 12, No. 4, 2005, pp. 537-555.
 D. A. Vila, L. G. G. de Goncalvez, D. L. Toll and J. R. Rozante, “Statistical Evaluation of Combined Daily Gauge Observations and Rainfall Satellite Estimates over Continental South America,” Journal of Hydrometeorology, Vol. 10, No. 2, 2009, pp. 533-543.
 S. Blenkinsop and H. J. Fowler, “Changes in European Drought Characteristics Projected by the PRUDENCE Regional Climate Models,” International Journal of Climatology, Vol. 27, No. 12, 2007, pp. 1595-1610.
 K. Strzepek, G. Yohe, J. Neumann and B. Boehlert, “Characterizing Changes in Drought Risk for the United States from Climate Change,” Environmental Research Letters, Vol. 5, No. 4, 2010, pp. 1-9.
 K. E. Taylor, R. J. Stouffer and G. A. Meehl, “An Overview of CMIP5 and the Experiment Design,” Bulletin of the American Meteorological Society, Vol. 93, No. 4, 2012, pp. 485-498. doi:10.1175/BAMS-D-11-00094.1
 C. Accadia, S. Mariani, M. Casaioli, A. Lavagnini and A. Speranza, “Sensitivity of Precipitation Forecast Skill Scores to Bilinear Interpolation and a Simple Nearest-Neightbor Average Method on High-Resolution Verification Grids,” Weather and Forecasting, Vol. 18, No. 5, 2003, pp. 918-932.
 R. H. Moss, et al., “The Next Generation of Scenarios for Climate Change Research and Assessment,” Nature, Vol. 463, 2010, pp. 747-756.
 R. K. Chaturvedi, J. Joshi, M. Jayaraman, G. Bala and N. H. Ravindranath, “Multi-Model Climate Change Projections for India under Representative Concentration Pathways,” Current Science, Vol. 103, No. 7, 2012, pp. 791-802.
 K. A. Hibbard, D. P. van Vuuren and J. Edmonds, “A Primer on the Representative Concentration Pathways (RCPs) and the Coordination Between the Climate and Integrated Assessment Modeling Communities,” CLIVAR Exchanges, Vol. 16, No. 2, 2011, pp. 12-15.
 B. Lloyd-Hughes and M. A. Saunders, “A Drought Climatology for Europe,” International Journal of Climatology, Vol. 22, No. 13, 2002, pp. 1571-1592.
 21T. B. McKee, N. J. Doesken and J. Kleist, “The Relationship of Drought Frequency and Duration to Time Scales,” Proceedings of the 8th Conference on Applied Climatology, California, 17-22 January 1993, pp. 179-184.
 R. A. Seiler, M. Hayes and L. Bressan, “Using the Standardized Precipitation Index for Flood Risk Monitoring,” International Journal of Climatology, Vol. 22, No. 11, 2002, pp. 1365-1376. doi:10.1002/joc.799
 J. A. Rivera and O. C. Penalba, “How Temporal Changes in Gamma Distribution Parameters Influence the Standardized Precipitation Index Estimation? Error Analysis in Drought Categorization in Southeastern South America,” Proceedings of the XI Argentinean Meteorology Congress, Mendoza, 28 May-1 June 2012, CD-ROM.
 O. C. Penalba and J. A. Rivera, “Using the Gamma Distribution to Represent Monthly Rainfall in Southeastern South America. Spatio-Temporal Changes in its Parameters,” Proceedings of the XI Argentinean Meteorology Congress, Mendoza, 28 May-1 June 2012, CD-ROM.
 D. C. Edwards and T. B. McKee, “Characteristics of 20th Century Dorught in the United States at Multiple Time Scales,” Atmospheric Science Paper No. 634, Colorado State University, Fort Collins, Colorado, 1997.
 I. Bordi, K. Fraedrich, J.-M. Jiang and A. Sutera, “Spatio-Temporal Variability of Dry and Wet Periods in Eastern China,” Theoretical and Applied Climatology, Vol. 79, No. 1-2, 2004, pp. 81-91.
 S. Morid, V. Smakhtin and M. Moghaddasi, “Comparison of Seven Meteorological Indices for Drought Monitoring in Iran,” International Journal of Climatology, Vol. 26, No. 7, 2006, pp. 971-985.
 J. Blazquez and M. N. Nunez, “Analysis of Uncertainties in Future Climate Projections for South America: Comparison of WCRP-CMIP3 and WCRP-CMIP5 Models,” Climate Dynamics, Vol. 41, No. 3-4, 2013, pp. 1039-1056.
 C. Gulizia and I. Camilloni, “Comparative analysis of the ability of a set of CMIP3 and CMIP5 global climate models to represent the precipitation in South America,” International Journal of Climatology, 2012, Unpublished.
 C. S. Vera, C. Junquas and L. Díaz, “Variability and Trends in Summer Precipitation in South Eastern South America through the WCRP/CMIP5 Models,” Proceedings of the XI Argentinean Meteorology Congress, Mendoza, 28 May-1 June 2012, CD-ROM.
 S. M. Vicente-Serrano, “Differences in Spatial Patterns of Drought on Different Time Scales: An Anamysis of the Iberian Peninsula,” Water Resources Management, Vol. 20, No. 1, 2006, pp. 37-60.
 H. J. Fowler and C. G. Kilsby, “Future Increases in UK Water Resource Drought Projected by a Regional Climate Model,” Proceedings of the BHS International Conference on Hydrology: Science & Practice for the 21st Century, London, 12-16 July 2004, pp. 15-21.
 J. Sheffield and E. F. Wood, “Projected Changes in Drought Occurrence Under Future Global Warming from Multi-Model, Multi-scenario, IPCC AR4 Simulations,” Climate Dynamics, Vol. 31, No. 1, 2008, pp. 79-105.