@article{Ivanova2019classification,
author={Ivanova, E.S.},
title={Classification of samples for comparative research},
journal={Vestnik of the St. Petersburg University of the Ministry of Internal Affairs of Russia},
publisher={SAINT-PETERSBURG UNIVERSITY OF THE MINISTRY OF INTERNAL AFFAIRS OF THE RUSSIAN FEDERATION},
year={2019},
pages={153-157},
volume={2019},
issue={4},
}