Štrumberger, Nada, Renata Bradvica, and Saša Vlakić. “Liquefied Petroleum Gas As Automotive Fuel in Environmental Protection”. Promet - Traffic&Transportation 13, no. 5 (1): 343-348. Accessed April 17, 2024. http://traffic.fpz.hr/index.php/PROMTT/article/view/726.