Zakrevskaya, E.; Beniamovsky, V.; Less, G.; Báldi-Beke, M. (2011). Integrated Biostratigraphy of Eocene Deposits in the Gubs Section (Northern Caucasus) with special Attention to the Ypresian/Lutetian Boundary and to the Peritethyan-Tethyan Correlation. Turkish Journal of Earth Sciences. 20: 753–792.
Zakrevskaya, E.; Beniamovsky, V.; Less, G.; Báldi-Beke, M.
2011
Integrated Biostratigraphy of Eocene Deposits in the Gubs Section (Northern Caucasus) with special Attention to the Ypresian/Lutetian Boundary and to the Peritethyan-Tethyan Correlation