@article{2003the,
author={, .. and , .. and , .. and , ..},
title={The origin of black shale-hosted Mn deposits  in Paratethyan basins: Constraints from geological events at the Eocene/Oligocene boundary},
journal={Russian Journal of Earth Sciences},
publisher={Геофизический центр Российской Академии Наук},
year={2003},
pages={255-272},
volume={5},
issue={4},
}