Marin, A.M.P., Menezes, R.S.C. and Salcedo, I.H. (2007) “Productivity of maize intercropped or not with gliricidia ammended with two organic fertilizers”, Pesquisa Agropecuaria Brasileira, 42(5), pp. 669–677. doi:10.1590/S1678-3921.pab2007.v42.7616.