Touchan et al. (2011)
Also: Touchan et al. 2011
Spatiotemporal drought variability in northwestern Africa over the last nine centuries
Touchan, R., Anchukaitis, K. J., Meko, D. M., Sabir, M., Attalah, S., & Aloui, A. (2011). Spatiotemporal drought variability in northwestern Africa over the last nine centuries.Climate Dynamics, 37(1-2), 237-252. Link to PDF
doi:10.1007/s00382-010-0804-4)
References
All IPCC definitions taken from Climate Change 2007: The Physical Science Basis. Working Group I Contribution to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, Annex I, Glossary, pp. 941-954. Cambridge University Press.