Hoa, H., T. Long, D. Tri, V. Thang, T. Lam, and N. Hao. “A Technique for Monitoring Diesel Common-Rail Direct Injection Engines Used in a Bus Fleet for Preventive Maintenance Purposes”. VNUHCM Journal of Engineering and Technology, Vol. 8, Aug. 2025, p. In press, http://stdjet.scienceandtechnology.com.vn/index.php/stdjet/article/view/1134.