Arf, Orivaldo, et al. “Incorporation of Bengal Velvetbean and Cultural Corn Residues before Winter Bean (Phaseolus Vulgaris L.) Crops”. Pesquisa Agropecuaria Brasileira, vol. 31, no. 8, Aug. 1996, pp. 563-8, https://doi.org/10.1590/S1678-3921.pab1996.v31.4520.