Sustainable intensification of cereal-based farming systems in Ghana' s Guinea Savanna: Constraints and opportunities identified with local communities - Ellis-Jones, J.; Larbi, Asamoah; Hoeschle-Zeledon, Irmgard; Dugje, I.Y.; Teli, I.A.; Buah, Saaka S.J.; Kanton, R.A.L.; Kombiok, M.J.; Kamara, A.Y.; Gyamfi, I. (International Institute of Tropical Agriculture, 2012)