@article{Kharlampenkov2021factor,
author={Kharlampenkov, E.I. and Kudryashova, I.A.},
title={Factor Model of Labor Productivity in the Coal Industry},
journal={Bulletin of Kemerovo State University. Series: Political, Sociological and Economic sciences},
publisher={Kemerovo State University},
year={2021},
pages={557-567},
volume={2020},
issue={4},
}