1. Biodiversity and soil functioning-from black box to can of worms;Andren;Appl. Soil Ecol.,1999
2. Role of soils in the 21st century;Arnold,2002
3. Tillage (plowing, subsoiling and no-tillage) effects on soil erodibility. II. Soil losses by runoff and “splash”;Barreiros,1996
4. No-tillage—its potential and adoption in the Alentejo;Basch,1996
5. Bergkamp, G., Bakker, M.M., Dorren, L.K.A., Dorren, H., Looijen, H., de Vente, J., 1997. Soil and water conservation in the Alentejo region (Portugal). Working paper no. 73, MEDALUS Project.