1. Assizes, R., 2003. Erosion assessment and conservation measures in sloping and mountainous olive production systems in Andalucía. OLIVERO student report series no. 2.
2. The use of tree mounds as benchmarks of previous land surfaces in a semiarid tree savanna, Botswana;Biot,1990
3. Bulk density;Blake,1986
4. Soil Erosion in Europe;Boardman,2006
5. Determinación de tasas de erosión utilizando métodos dendrocronologógicos en raíces expuestas, Dos ejemplos en la vertiente septentrional de la Sierra de Guadarrama, Estudios recientes (2000–2002);Bodoque,2002