PT Journal AU Hammer, J Poliak, M Jaskiewicz, M SO Transport And Communications PY 2020 BP 1 EP 5 VL 8 IS 1 DI 10.26552/tac.C.2020.1.1 WP https://tac.uniza.sk/artkey/tac-202001-0001.php SN 13395130 ER