F. Santos, C.A. et al. 1995. Natural hybridization on pigeonpea grown in the Brazilian semi-arid. Pesquisa Agropecuaria Brasileira. 30, 9 (Sep. 1995), 1183–1187. DOI:https://doi.org/10.1590/S1678-3921.pab1995.v30.4412.