RT Journal Article SR Electronic A1 Varjan, Pavol A1 Gnap, Jozef A1 Semanová, Štefánia A1 Stopka, Ondrej T1 JF Transport And Communications YR 2017 VO 5 IS 2 SP 33 OP 36 DO 10.26552/tac.C.2017.2.8 UL https://tac.uniza.sk/artkey/tac-201702-0008.php AB