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https://drive.google.com/file/d/1gNShbBkgvq6bI5QyVdiWLNxck3kMdxzI/view?usp=sharing

https://www.academia.edu/5876223/Is_the_Keetch_Byram_drought_index_KBDI_directly_related_to_plant_water_stress

https://www.researchgate.net/publication/240413155_Is_the_Keetch-Byram_drought_index_KBDI_directly_related_to_plant_water_stress