@INBOOK {CHIANU:2000, title = {Labour use and productivity in new fallow systems as alternatives to slash-and-burn agriculture in the derived savannas of Nigeria}, author = {Chianu, J. and Spencer, D. and Atobatele, J. }, editor = {Renard, G. and Krieg, S. and Lawrence, P. and Von Oppen, M. }, year = {2000}, type = {Farmers and scientists in a changing environment: assessing research in West Africa. Weikersheim, Germany}, pages = {429--438}, publisher = {Margraf Verlag}, }