RT Journal Article SR Electronic A1 Dimcheva, Gergana A1 Stoyanov, Ivaylo T1 JF Transport And Communications YR 2019 VO 7 IS 2 SP 5 OP 9 DO 10.26552/tac.C.2019.2.2 UL https://tac.uniza.sk/artkey/tac-201902-0002.php AB