Ambarev, Krasimir, and Valyo Nikolov. “EXPERIMENTAL STUDY OF TOXIC COMPONENTS IN THE EXHAUST GASES DURING THE OPERATION OF A CAR ENGINE WITH GASOLINE AND LPG”. ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference 3 (January 16, 2024): 20–23. Accessed November 25, 2024. https://journals.rta.lv/index.php/ETR/article/view/7304.