RT Journal Article SR Electronic A1 Poliak, Miloš A1 Semanová, Štefánia A1 Kilianová, Katarína T1 JF Transport And Communications YR 2013 VO 1 IS 1 SP 21 OP 24 DO 10.26552/tac.C.2013.1.5 UL https://tac.uniza.sk/artkey/tac-201301-0005.php AB