Travlos, I.S., G. Liakopoulos, G. Karabourniotis, C. Fasseas and A.J. Karamanos (2008). Circadian leaflet movements of Tylosema esculentum (Burch) A. Schreib, and the abolishment of these diurnal movements by potassium deficiency. Journal of Arid Environments 72(9), 1745-1750.
https://doi.org/10.1016/j.jaridenv.2008.03.020