1. Tricart, J., KiewietdeJonge, C.: Ecogeography and Rural Management – a Contribution to the International Geosphere-Biosphere Programme. Longman Group, Harlow (1992)
2. Van-Camp, L., Bujarrabal, B., Gentile, A.R., Jones, R.J.A., Montarella, L., Olazábal, C., Selvaradjou, S.-K.: Reports of the Technical Working Groups Established under the Thematic Strategy for Soil Protection, EUR 21319 EN/1-6, OPOCE, Luxembourg (2004)
3. European Commission: Proposal for a Directive of the European Parliament and of the Council establishing a framework for the protection of soil and amending Directive 2004/35/EC. COM/2006/0232 final Brussels, 22/09/2006; p. 30 (2006)
4. Pimentel, D.: World Soil Erosion and Conservation. Cam. Univ. Press, Cambridge (1993)
5. Foley, J.A., DeFries, R., Asner, G.P., Barford, C., Bonan, G., Carpenter, S.R., Chapin, F.S., et al.: Global consequences of land use. Science 309, 570–574 (2005)