@article{Grebenukov2012classification,
author={Grebenukov, V..},
title={Classification of criteria used in russian scientific references to single out mesolithic period (till late 80s of XX century)},
journal={Bulletin of Nizhnevartovsk State University},
publisher={Nizhnevartovsk State University},
year={2012},
pages={20-24},
volume={},
issue={4},
}