@article{2007strontium,
author={, .. and , .. and , ..},
title={Strontium isotope stratigraphy: Possible applications for age estimation and global correlation of Late Permian carbonates of the Pechishchi type section, Volga River},
journal={Russian Journal of Earth Sciences},
publisher={Геофизический центр Российской Академии Наук},
year={2007},
pages={1-8},
volume={9},
issue={1},
}