1. History of climate and vegetation of east central Nigeria as deduced from pollen analysis: preliminary investigations;Agwu;Bulletin de liaison de l'Association Sénégalaise pour l'Etude du Quaternaire Africain,1986
2. Etude palynologique et statistique de quelques échantillons fluviatiles actuels du bassin de la Sanaga;Bengo,1992
3. Bonnefille, R., 1972. Associations polliniques actuelles et quaternaires en Ethiopie (Vallées de l'Awash et de l'Omo). Unpublished Thesis, University of Paris VI, France, 513 pp.
4. High resolution vegetation and climate change associated with Pliocene Australopithecus afarensis;Bonnefille;Proceedings of the National Academy of Sciences,2004
5. Mid-Holocene and Last Glacial Maximum African monsoon changes as simulated within the Paleoclimate Modelling Intercomparison Project;Braconnot;Global and Planetary Change,2000