Carlos C. Silva, José, Waldeciro Colaço, Hélio de A. Burity, Neydson C. M. Ferreira, Márcia V. B. Figueiredo, and Cosme R. Martinez. 1998. “Herbicides on Nodulation and N2-Fixation in Cowpea”. Pesquisa Agropecuaria Brasileira 33 (1):77-86. https://doi.org/10.1590/S1678-3921.pab1998.v33.4816.