Hrbac, Roman, Vaclav Kolar, and Tomas Mlcak. “Limiting the Influence of Regulated Electrical Drainage on Track Circuits”. Elektronika ir Elektrotechnika 24, no. 5 (October 16, 2018): 51-56. Accessed July 16, 2020. http://eejournal.ktu.lt/index.php/elt/article/view/21843.