Srithamarong T. Concept of Road Slope Analysis for the Transport of A Modified 6-Wheel Truck. Def. Technol. Acad. J. [internet]. 2020 Dec. 16 [cited 2025 Mar. 15];2(6):26-43. available from: https://sc01.tci-thaijo.org/index.php/dtaj/article/view/240480