Lira, M. de A. (1996) “Nitrogenous and phosphatic fertilization effects on elephant grass (<i>Pennisetum purpureum</i>, Schum.) productivity”, Pesquisa Agropecuaria Brasileira, 31(1), pp. 19–26. doi: 10.1590/S1678-3921.pab1996.v31.4447.