B. de A. Araújo, T. R. G. Queiroz, W. L. V. Torres, and F. J. C. Moreira, “Drought stresses in the productivity of cowpea (Vigna unguiculata) in the municipality of Crateús, Ceará, Brazil”, Green Journal, vol. 14, no. 2, pp. 312–316, Apr. 2019.