N Sidek, Mohamed Ahmed Hafez, A S Abdul Rahman, N.N. Ahmad Nazmi. “Evaluation Performance of Polyurethane (PU) and Concrete Foam As Filler for Road Embankment: - A Soft Soil Treatment Solution”. Mathematical Statistician and Engineering Applications, vol. 71, no. 4, Dec. 2022, pp. 7199-08, doi:10.17762/msea.v71i4.1338.