@INBOOK {BRUSSARD:1993c, title = {Soil faunal activity in relation to the sustainability of agricultural systems in the humid tropics}, author = {Brussaard, L. and Hauser, S. and Tian, G. }, year = {1993}, type = {Soil organic matter dynamics and sustainability of tropical agriculture}, pages = {241--256}, publisher = {John Wiley & Sons with Sayce Publishing(UK), the catholic Universit of Leuven (Belgium) and IITA, Ibadan}, }