1. Total porosity and random roughness of the interrow zone as influenced by tillage;Allmaras;USA, Conservation Research Report,1966
2. Effects of soil water content during primary tillage – laser measurements of soil surface changes;Arvidsson;Soil and Tillage Research,2006
3. Base de dados meteorológicos, USP/ESALQ Departamento de Engenharia e Biossistemas. http://www.leb.esalq.usp.br/postoaut.html (accessed 20.09.11).
4. Relations of soil surface roughness with the rainfall volume and water aggregate stability;Bertol;Revista Brasileira de Ciência do Solo,2006
5. Boiffin, J., 1984. La dégradation structurale des couches superficielles du sol sous láction des pluies. Paris, INAPG, 1984, 320 pp. (Doctoral Thesis).