@INBOOK {HAUSER:1997, title = {Role of earthworms in traditional and improved low-input agricultural systems in West Africa}, author = {Hauser, S. and Vanlauwe, B. and Asawalam, D. and Norgrove, L. }, editor = {Brussaard, L. and Ferrera-Cerrato, R. }, year = {1997}, type = {Soil ecology in sustainable agricultural systems}, pages = {113--136}, publisher = {CRC Press/Lewis Publishers}, address = {Boca Raton, New York, USA}, }