Ahmad, Azhar, and Jamaluddin M. Ali. “Planar Transition Curves Using Quartic Bezier Spiral”.
Journal of Science and Mathematics Letters 2, no. 1 (January 19, 2019): 78–85. Accessed April 7, 2025.
https://ejournal.upsi.edu.my/index.php/JSML/article/view/452.