Forootan, E., Khaki, M., Schumacher, M., Wulfmeyer, V., Mehrnegar, N., van Dijk, A., Brocca, L., Farzaneh, S., Akinluyi, F., Ramillien, G., Shum, C. K., Awange, J. and Mostafaie, A. (2019), Understanding the global hydrological droughts of 2003-2016 and their relationships with teleconnections, Science of the Total Environment, 650, 2587-2604.
https://dx.doi.org/10.1016/j.scitotenv.2018.09.231.