Keyword "LOWER OLIGOCENE" in:

Paleoenvironmental changes in the onset of the Oligocene and their impact on the biota of the marine and terrestrial ecosystems
Krhovský,J., Adamová,M., Bůžek,Č., Čtyroký,P., Fejfar,O., Hladíková,J., Konzalová,M., Kvaček,Z., Maslowská,H., Pacltová,B., Youssef,A., volume 25, 1993 (GRR for 1991), pages 88–89
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