Beltrano, J. et al. 1999. Plant architecture of <i>Paspalum vaginatum</i> Schwartz modified by nitrate and ammonium nutrition. Pesquisa Agropecuaria Brasileira. 34, 7 (Jul. 1999), 1159–1166. DOI:https://doi.org/10.1590/S1678-3921.pab1999.v34.5317.