Wen Kam Leong, Alex Lung Keat Ngo, Alvin Choon Hsien Wong, Jen Hua Ling, and How Teck Sia. “The Mandatory 4 Years Desludging Frequency of Underground Septic Tanks in Residential Areas: A Case Study in Sibu Sarawak, East Malaysia”. Journal of the Civil Engineering Forum, Vol. 8, no. 2, May 2022, pp. 147-56, doi:10.22146/jcef.3812.