M. de A. Libra, I. Farias, A. de P. A. Fernandes, L. M. Soares, and J. C. B. D. Junior, “Response stability of signal grass (<i>Brachiaria decumbens</i>, Stapf.) with increasing nitrogen and phosphorus levels”, PAB, vol. 29, no. 7, pp. 1151–1157, Jul. 1994.