Fernandes, J.B. et al. 1993. Environmental adaptability and virus incidence in cowpea cultivars in Rio Grande do Norte, Brazil. Pesquisa Agropecuaria Brasileira. 28, 1 (Jan. 1993), 33–37. DOI:https://doi.org/10.1590/S1678-3921.pab1993.v28.3859.