M. B. S. Lopes, H. B. Barros, A. F. Chagas Júnior, M. M. dos Santos, N. C. da Silva, and R. R. Fidelis, “Water-retaining polymer as a soil conditioner in cowpea under water stress”, Com. Sci., vol. 9, no. 4, pp. 680–686, Jan. 2019.