Chua, Guang Seng, and Heng Boon Koh. “Optimizing of Counterfort Retaining Wall With Varying Heights”. Recent Trends in Civil Engineering and Built Environment, vol. 6, no. 1, May 2025, pp. 115-28, https://penerbit.uthm.edu.my/periodicals/index.php/rtcebe/article/view/15063.