Alatorre, L. C., and S. Beguería. “Idenitifying Active Erosion Areas and Areas at Risk by Remote Sensing : An Example in a Badlands Landscape on Marls in Teh Central Spanish Pyrenees”. Cuadernos De Investigación Geográfica, vol. 35, no. 2, June 2013, pp. 171-94, doi:10.18172/cig.1217.