1. Allmaras, R.R., Burwell, R.E., Holt, R.F., 1966. Total porosity and random roughness of the interrow zone as influenced by tillage. USDA. Conservation report no. 7, 22 pp.
2. Testing roughness indices to estimate soil surface roughness changes due to simulated rainfall;Bertuzzi;Soil and Tillage Research,1990
3. Morphological characteristics of soil crust development stages on an experimental field;Bresson;Geoderma,1990
4. Callebaut, F., Gabriels, D., DeBoodt, M., 1985. Assessment of soil surface sealing and crusting. Proc. Ghent symposium, Flanders Research Centre for soil erosion and conservation. Dept. Soil Physics, State University of Ghent, 374 pp.
5. Dixon, L., Barker, R., Bray, M.L., Farres, P.J., Hooke, J., Inkpen, R., Merel, A., Payne, D., Shelford, A., 1997. Analytical photogrammetry for geomorphological research. In: Lane, S.N., Richards, K.S., Chandler, J.H. (Eds.), Landform Monitoring, Modelling and Analysis. Wiley, Chichester, in press.