Amaral, J. A. T. do, Cordeiro, A. T. and Rena, A. B. (2000) “Effects of aluminum, nitrate and ammonium on the metabolic nitrogened composition and of carboidrates in <i>Stylosanthes guianensis</i> and <i>S. macrocephala</i>”;, Pesquisa Agropecuaria Brasileira, 35(2), pp. 313–320. doi: 10.1590/S1678-3921.pab2000.v35.5769.