Machado, C.M.N., Fleck, N.G. and Souza, R.S. de (2014) “Efficiency in land utilization, yield and yield components of crops in association”, Pesquisa Agropecuaria Brasileira, 22(11/12), pp. 1167–1183. doi:10.1590/S1678-3921.pab1987.v22.14666.