De Dapper, Morgan, Rudi Goossens, and Thérèse Ongena. 1989. “The Use of SPOT Images for the Assessment and Mapping of Geomorphology and Land Degradation by Savanisation in a Wet-and-Dry Tropical Forested Environment (Lubumbashi, Shaba, Zaire)”. Geografia Fisica E Dinamica Quaternaria 2 (January): 87-91. https://www.gfdq.glaciologia.it/index.php/GFDQ/article/view/1140.