Robertson, I., Gebregeorgis, E. G., Koprowski, M., Zhou, L. P., Gao, P., Williams, A. P., . . . Wils, T. H. G. (2020). Historical droughts recorded in extended Juniperus procera ring-width chronologies from the Ethiopian Highlands. International Journal of Biometeorology, 64(5), pp. 739-753. doi:10.1007/s00484-020-01863-7

Robertson, Iain, E. Gebrehiwot Gebregeorgis, M. Koprowski, L. P. Zhou, P. Gao, A. P. Williams, Z. Eshetu, and T. H. G. Wils. "Historical Droughts Recorded in Extended Juniperus Procera Ring-width Chronologies From the Ethiopian Highlands." International Journal of Biometeorology 64, no. 5 (2020): 739-753.

Robertson, Iain, et al. "Historical Droughts Recorded in Extended Juniperus Procera Ring-width Chronologies From the Ethiopian Highlands." International Journal of Biometeorology 64.5 (2020): 739-753.