Bown & Cooper 1989. Conical calcareous nannofossils in the Mesozoic. Crux, J.A.; van Heck, S.E.[Eds]. Nannofossils and their applications. Proceedings of the International Nannofossil Association Conference, London 1987., John Wiley & Sons, New York, 1989: 1-356. Chapter pagination: 98-106