Neto, Francisco Bezerra, and Robert H. Robichaux. 1997. “Spatial Arrangement and Density Effects on an Annual Cotton Cowpea Maize Intercrop. II. Yield and Biomass”. Pesquisa Agropecuaria Brasileira 32 (10):1029-37. https://doi.org/10.1590/S1678-3921.pab1997.v32.4752.