PT Journal AU Zeman, D Jurankova, P Svadlenka, L SO Transport And Communications PY 2013 BP 33 EP 39 VL 1 IS 1 DI 10.26552/tac.C.2013.1.8 WP https://tac.uniza.sk/artkey/tac-201301-0008.php SN 13395130 ER