Y. SHANDINI, P. A. KOUSKE, S. NGUIYA, and M. P. MARCELIN, “Structural setting of the Koum sedimentary basin (north Cameroon) derived from EGM2008 gravity field interpretation”, Contrib. Geophys. Geod., vol. 48, no. 4, pp. 281–298, Dec. 2018, doi: 10.2478/congeo-2018-0013.