Morgado, Luiz Balbino, and Robert Williams Willey. “Effects of Plant Population and Nitrogen Fertilizer on Yield and Efficiency of Maize-Bean Intercropping”. Pesquisa Agropecuaria Brasileira 38, no. 11 (November 1, 2003): 1257–1264. Accessed November 12, 2025. https://apct.sede.embrapa.br/pab/article/view/6698.