Dias, Paulo Francisco, et al. “Nitrogen-Fixing Trees and Soil Macrofauna in Digitaria Hybrid Pasture”. Pesquisa Agropecuaria Brasileira, vol. 41, no. 6, June 2006, pp. 1015-21, https://doi.org/10.1590/S1678-3921.pab2006.v41.7240.