Calibration of calcareous nannofossils and planktonic foraminifers zonation in the Lower and Middle Paleocene of Bulgaria

by Stoykov, K., Ivanov, M., Juranov, S.
Source: 1. Geologica balcanica 1. 0324-0894 1. Roč. 35, č. 1-2 (2005), s. 3-9