@article{Kravtsov2015advanced,
author={Kravtsov, Y.A. and Arkhipov, E.V. and Bakin, M.E.},
title={Advanced methods of voice-frequency track circuits coding},
journal={Transport automation research},
publisher={FSBEI HE "Emperor Alexander I St. Petersburg State Transport University"},
year={2015},
pages={119-126},
volume={1},
issue={2},
}