Mistrić, Davor, Leonard Eleršek, and Ernest Bazijanac. “Examination of Applicability of Engine Condition Trend Monitoring to Bell 2068 Ill Helicopter”. Promet - Traffic&Transportation 14, no. 1 (1): 23-27. Accessed March 29, 2024. http://traffic.fpz.hr/index.php/PROMTT/article/view/842.