Santos, C. A. F., & Araujo, F. P. de. (2000). Grain yield and plant morphology of cowpea genotypes with different planting densities under irrigated and rainfed conditions. Pesquisa Agropecuaria Brasileira, 35(10), 1977–1984. https://doi.org/10.1590/S1678-3921.pab2000.v35.5984