Ковтун, А.К., and В.М. Турчак. “The Device Engine Protection from Improper Fuel”. Proceedings of National Aviation University (archive) 38, no. 1 (January 1, 2009): 211–213. Accessed April 13, 2026. http://jrnl.kai.edu.ua/index.php/visnik/article/view/1698.