Ivković, Ivan, Snežana Kaplanović, and Dragan Sekulić. “Analysis of External Costs of CO2 Emissions for CNG Buses in Intercity Bus Service”. Transport 34, no. 5 (November 11, 2019): 529-538. Accessed December 22, 2024. https://journals.vilniustech.lt/index.php/Transport/article/view/11473.