Tzvetkova, Svetla. “GUIDELINES FOR IMPROVING THE ENVIRONMENTAL FRIENDLINESS AND SAFETY OF RAILWAY TRANSPORT FREIGHTS OF DANGEROUS CARGO WITHIN THE REPUBLIC OF BULGARIA”. Proceedings of CBU in Economics and Business 1 (November 16, 2020): 141-146. Accessed November 5, 2026. https://ojs.cbuic.cz/index.php/peb/article/view/31.