Ramalho, Magno Antonio P., et al. “Maize and Bean Cultivars in Monoculture and in Two Intercropping Systems”. Pesquisa Agropecuaria Brasileira, vol. 19, no. 7, Apr. 2014, pp. 827-33, doi:10.1590/S1678-3921.pab1984.v19.15812.