Heaton, T.H, prothero, D.R ,1996- Faunal stability during the early oligocene climatic crash .Palaeogeography, Palaeoclimatology,Palaeoecology.127:257-283.
Perch-Nielsen,K.,1985- Cenozoic calcareous nannofossils .In H.M.bolli,J.B.Saunders &K.Perch –nilsen (Eds),plankton stratigraphy.Camb.Earth sci,Ser 1,PP.427-554.
Biggp,J. (in press) - Eocene planktonic foraminifera and calcareous nannoplankton of the paris basis and Belgium.V.25 N.2 PP.69-89.
Francisco, J., Sierro,D., Hodell, A. & Christopher D., 2003- Calcareous plankton dissolution pattern and coccolithophore assemblages during the last 600 Kyr at ODP site 1089 (cape Basin ,south Atlantic) Paleoceanographic
Implication, Palaeogeography, Palaeoclimatology , Palaeoecology,volum 196,issues 3-4,1 August 2003,page 409-426.