Bezerra Neto, F. and Robichaux, R.H. 1996. Spatial arrangement and density effects on an annual cotton/cowpea/maize intercrop. I. Agronomic efaciency. Pesquisa Agropecuaria Brasileira. 31, 10 (Oct. 1996), 729–741. DOI:https://doi.org/10.1590/S1678-3921.pab1996.v31.4543.