Lee, Sung How, and Kim Seng Chia. “Navigating an Auto Guided Vehicle Using Rotary Encoders and Proportional Controller”. International Journal of Integrated Engineering 9, no. 2 (December 21, 2017). Accessed April 1, 2020. https://publisher.uthm.edu.my/ojs/index.php/ijie/article/view/1690.