Borghi, E. and Crusciol, C.A.C. (2007) “Corn yield, spacing and intercropping modalities with Brachiaria brizantha in no-tillage system”, Pesquisa Agropecuaria Brasileira, 42(2), pp. 163–171. doi:10.1590/S1678-3921.pab2007.v42.7551.