OKPARA, D A; OMALIKO, C P E. Productivity of yambean (Sphenostylis stenocarpa) - yellow yam (Dioscorea cayenensis) intercropping. The Indian Journal of Agricultural Sciences, Delhi, India, v. 65, n. 12, 2012. Disponível em: https://epubs.icar.org.in/index.php/IJAgS/article/view/19165. Acesso em: 24 oct. 2025.