Kropáček, Jan, Calogero Schillaci, Riccardo Salvini, and Michael Märker. 2016. “Assessment of Gully Erosion in the Upper Awash, Central Ethiopian Highlands Based on a Comparison of Archived Aerial Photographs and Very High Resolution Satellite Images”. Geografia Fisica E Dinamica Quaternaria 39 (2): 161-70. https://doi.org/10.4461/GFDQ.2016.39.15.