1. Faculty of Sciences and Technologies, University of Kinshasa, Kinshasa, DR Congo
2. Department of Research, LeGeolog Research Team, Kinshasa, DR Congo
3. Pedology and Geochemistry Laboratory, University of Kinshasa, Kinshasa, DR Congo
4. Laboratory of Space Geodesy, Astronomy and Geophysics, Geographical Institute of Congo, Kinshasa, DR Congo