Usman R. Analisis Kerusakan Katup pada Mesin Diesel 9 L21/31 Internal Combustion Engine. Prosid Sem Nas Teknoka [Internet]. 2017 Dec. 8 [cited 2024 Nov. 22];1(1):M203 - M212. Available from: https://journal.uhamka.ac.id/index.php/teknoka/article/view/894