Rao, M. R., and L. B. Morgado. “A Review of Maize-Beans and Maize-Cowpea Intercrop Systems in the Semiarid Northeast Brazil”. Pesquisa Agropecuaria Brasileira 19, no. 2 (April 16, 2014): 179–192. Accessed August 5, 2026. https://apct.sede.embrapa.br/pab/article/view/15374.