Macedo Nunes Costa, M.M. et al. 1997. Yield, yield components and growth and distribution of roots of cowpea under water stress. Pesquisa Agropecuaria Brasileira. 32, 1 (Jan. 1997), 43–50. DOI:https://doi.org/10.1590/S1678-3921.pab1997.v32.4605.