Khokerashvili, Z.; Tsanava, D. Propagation of Carbon Monoxide in Road Tunnels in Case of Fire by Considering the Critical Velocity, Backlayering and Gradient Factor : Print Version Was Published: Book of Abstract, The International Scientific and Technical Conference: "Problems of Engineering Sciences " Yerevan University of International Relations Named After A. Shirakatsi Yerevan - Republic of Armenia, May 20-22, 2022. GS 2022, 4, 63-65.