1. Azbel’, A.Ya., Grigyalis, A.A., and Kuznetsova, K.I., Jurassic System. Upper Series. The European part of the USSR, in Prakticheskoe rukovodstvo po mikrofaune SSSR. T. 5. Foraminifery mezozoya (Practical Guide to Microfauna of the USSR, Vol. 5: Mesozoic Foraminifers), Leningrad: Nedra, 1991, pp. 64–76.
2. Bornemann, A., Case studies of Mesozoic calcareous nannofossils: implications for palaeoecology, calcareous nannofossil morphology and carbonate accumulation, Dissertation zur Erlangung des Grades eines Doktors der Naturwissenschaften der Fakultat fur Geowissenschaften der Ruhr-Universitat Bochum, Bochum, 2003.
3. Jurassic;P.R. Bown,1998
4. Bown, P.R., Cooper, M.K., and Lord, A.R., A calcareous nannofossils biozonation scheme for the Early to Mid Mesozoic, Newsl. Stratigr., 1988, vol. 20, pp. 91–114.
5. Colombie, C., Giraud, F., Schnyder, J., et al., Timing of sea level, tectonics and climate events during the upper most Oxfordian (Planula zone) of the Iberian ramp (northeast Spain) Palaeogeogr., Palaeoclimatol., Palaeoecol., 2014, vol. 412, pp. 17–31.