Guareschi, R.F. et al. (2010) “MAIZE AND SORGHUM HYBRIDS SILAGE PRODUCTION WITHOUT NITROGEN FERTILIZATION IN THE SUMMER GROWING SEASON”, Pesquisa Agropecuária Tropical [Agricultural Research in the Tropics], 40(4), pp. 541–546. doi:10.5216/pat.v40i4.6389.