@article{Khamidullina2014coal,
author={Khamidullina, E.. and Timofeeva, S.S. and Smirnov, G..},
title={Coal Рroduction Safety by Risk Indexes},
journal={Safety in Technosphere},
publisher={INFRA-M Academic Publishing LLC.},
year={2014},
pages={34-39},
volume={3},
issue={4},
}