Plant adaptations to the combination of drought and high temperatures. Zandalinas SI, Mittler R, Balfagón D, Arbona V, Gómez-Cadenas A.Physiol Plant. 2018 Jan;162(1):2-12.

How ecologists define drought, and why we should do better.Slette IJ, Post AK, Awad M, Even T, Punzalan A, Williams S, Smith MD, Knapp AK.Glob Chang Biol. 2019 Oct;25(10):3193-3200. 

The ecohydrological context of drought and classification of plant responses.Feng X, Ackerly DD, Dawson TE, Manzoni S, Skelton RP, Vico G, Thompson SE.Ecol Lett. 2018 Nov;21(11):1723-1736.