Nguyen, Van Trang, Huynh Thi Nguyen, Thanh Cong Huynh, and Huu Duy Dao. “A Preliminary Study of Spark-Ignition System for Free-Piston Linear Engine”. Journal of Technical Education Science 18, no. 1 (February 28, 2023): 61–68. Accessed April 7, 2026. https://www.jte.edu.vn/index.php/jte/article/view/1281.