1] Zlatomir Živanovic ANALYSIS OF RENEWAL BUS FLEET CPTC''BELGRADE'' FROM THE ENVIRONMENTAL AND ENERGY ASPECTS" - 12. Međunarodna konferencija o dostignućima elektrotehnike, mašinstva i informatike, 02.03.2015.
(https://ekonferencije.com/en/paper/analysis-of-renewal-bus-fleet-/2981)

2] Zlatomir Živanovic A COMPARATIVE ANALYSIS OF CNG AND HYBRID BUSES TO DIESEL BUSES" - DEMI 2011, 28.12.2010.
(https://ekonferencije.com/en/paper/a-comparative-analysis-of-cng-/31)