“Spatio-Temporal Characterization of Agricultural Drought Using Soil Moisture Deficit Index (SMDI) in the Upper Tana River Basin, Kenya”. International Journal of Engineering Research and Advanced Technology (ijerat) (E-ISSN 2454-6135) DOI: 10.31695 IJERAT, vol. 5, no. 2, Feb. 2019, pp. 93-106, https://doi.org/10.31695/IJERAT.2019.3388.