@article{Lupal2017development,
author={Lupal, N..},
title={Development of signaling devices in the period of imperialism (1906-1917). Part 2: Regulation of traffic, electric rod system and open line block},
journal={Transport automation research},
publisher={FSBEI HE "Emperor Alexander I St. Petersburg State Transport University"},
year={2017},
pages={302-311},
volume={3},
issue={2},
}