1. Briaud, J.L., James, R.W., Hoffman, S.B., 1997. NCHRP Synthesis 234: Settlement of Bridge Approaches (the Bump at the End of the Bridge). Transportation Research Board, National Research Council, Washington, DC, p.75.
2. Hopkins, T.C., 1985. Long-Term Movements of Highway Bridge Approach Embankments and Pavements. University of Kentucky, Kentucky Transportation Research Program, USA.
3. Hunter, D., 1988. Lime-induced heave in sulfate-bearing clay soils. Journal of Geotechnical Engineering, ASCE, 114(2): 150–167. [doi:10.1061/(ASCE)0733-9410(1988)114:2(150)]
4. Jayawickrama, P., Nash, P., Leaverton, M., Mishra, D., 2005. Water Intrusion in Base/Subgrade Materials at Bridge Ends. TxDOT Report, FHWA/TX-06/0-5096-1, Texas Tech University, Lubbock, Texas.
5. Kramer, S.L., Sajer, P., 1991. Bridge Approach Slab Effectiveness. Final Report, Washington State Department of Transportation, Olympia, Washington.