P.E.Y. Danguene

University of Bangui, P.O. Box Bangui, Central African Republic

T. Ngnotue

Department of Geology, Faculty of Science, University of Dschang, P.O.Box: 67 Dschang, W Region, Cameroon

S. Ganno

Laboratory of Petrology and Structural Geology, Faculty of Science, University of Yaoundé I, PO Box 3412 Messa-Yaoundé, Cameroon

J. Biandja

University of Bangui, P.O. Box Bangui, Central African Republic

B. Kankeu

Institute of Mining and Geological Research, Yaoundé, Cameroon

J.P. Nzenti

Laboratory of Petrology and Structural Geology, Faculty of Science, University of Yaoundé I, PO Box 3412 Messa-Yaoundé, Cameroon