Bruno, the complete reference is: Barrera E. & Savin S.M. (1987) Effect of sample preparation on the d18O value of fine-grained calcite. Chem. Geol. (Isot. Gesc. Sec.) 66, 301-305. Ciao, Michael Bruno Glaser wrote: > Dear Michael, > > thanks for the advice. Please could you tell me the whole citation of Barrera & Savin > (1987) > > Many thanks > > Bruno > > Michael Böttcher schrieb: > > > Dr. Bruno Glaser > > Institute of Soil Science and Soil Geography > > University of Bayreuth > > D-95440 Bayreuth > > Germany