1. Beltrando G, Cadet DL (1990) Variabilité interannuelle de la petite saison des pluies en Afrique Orientale: relations avec la circulation atmosphérique générale. Veille climatique satellitaire ORSTOM et C.M.S. 33:19–36
2. Bartlein PJ, Prentice IC, Webb T (1986) Climatic response surfaces from pollen data for some eastern North American taxa. J Biogeogr 13:35–57
3. Birks HJB (1981) The use of pollen analysis in the reconstruction of past climates: a review. In: Wigley TML et al. (eds) Climate and history. Cambridge University Press, pp 111–138
4. Bonnefille R, Riollet G (1988) The Kashiru pollen sequence (Burundi). Palaeoclimatic implications for the last 40.000 yr B.P. in tropical Africa. Quat Res 30:19–35
5. Bonnefille R, Riollet G (1987) Palynological spectra from the Upper Laetolil Beds. In: Leakey MD, Harris JM (eds) Laetoli, a Pliocene site in Northern Tanzania. Clarendon Press, Oxford, pp 52–61