Hanipah, Mohd Razali, and M. Haziq Adham Rosli. “Performance Characteristics of a Small Poppet Valve Crankshaft Engine in Free-Piston Engine Mode”. International Journal of Automotive and Mechanical Engineering 18, no. 3 (November 2, 2021): 9149–9157. Accessed April 23, 2024. https://journal.ump.edu.my/ijame/article/view/5971.