@article{Karl2019the,
author={Karl, A.M.},
title={The proportion between covert investigative actions and operative-search activities},
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={144-151},
volume={2019},
issue={3},
}