Shoaei, M. D., Alkarni, A., Noorzaei, J., Jaafar, M. S. and Huat, B. B. K. (2012) “Review of available approaches for ultimate bearing capacity of two-layered soils”, Journal of Civil Engineering and Management, 18(4), pp. 469-482. doi: 10.3846/13923730.2012.699930.