Soil organic matter dynamics and sustainability of tropical agriculture : proceedings of an International Symposium organized by the Laboratory of Soil Fertility and Soil Biology, Katholieke Universiteit Leuven (K.U. Leuven) and the International Institute of Tropical Agriculture (IITA) and held in Leuven, Belgium, 4-6 November 1991
edited by K. Mulongoy and R. Merckx
Bok Engelsk 1993