citation
Hauser, S., Vanlauwe, B., Asawalam, D. & Norgrove, L. (1997). Role of earthworms in traditional and improved low-input agricultural systems in West Africa. In L. Brussaard, R. Ferrera-Cerrato, Soil ecology in sustainable agricultural systems. Boca Raton, New York, USA: CRC Press/Lewis Publishers, (p. 113-136).