1. Abergel, J., Lamachère, J.M., Lidon, B., Mokadem, A., Van Driel, W., 1993. Mise en valeur agricole des bas-fonds du Sahel: Typologie, fonctionnement hydroloque, potentialités agricoles, Rapport Finale du Projet CORAF-R3S, Ouagadougou, Burkina Faso, CIEH, 335 pp
2. Ashraf, M., Palada, M.C., Masajo, T.M, Wakatsuki, T., 1988. Rice-based cropping systems for inland valleys and their improvement possibilities in Nigeria, In: Abalu, O.G.I., Kalu, B.A. (Ed.), Improved Agricultural Technologies for Small-scale Nigerian Farmers, Nig. Farm. Syst. Res. Netw. Publ., Jos, Nigeria, pp. 149–171
3. Becker, L., Diallo, R., 1992. Characterization and classification of rice agro-ecosystems in Côte d'Ivoire, West Africa Rice Development Association (WARDA), Bouaké, Côte d'Ivoire, 135 pp
4. Green manure technology: Potential usage, limitations. A case study for lowland rice;Becker;Plant Soil,1995
5. Nitrogen-use efficiency in tropical lowland rice systems: Contributions from indigenous and applied nitrogen;Cassman;Field Crops Res.,1997