Upaphai, W., Bunyawanichakul, P., Janthong, M. Trajectory tracking control design for an autonomous tractor using fuzzy PID controller. Int. J. Agric. Tech. [internet]. 2017 Jul. 20 [cited 2025 Aug. 16];13(4):501-19. available from: https://li04.tci-thaijo.org/index.php/IJAT/article/view/6759