1. Abu-Hejleh N, O’Neil MW, Hanneman D, Atwooll WJ. Improvement of the geotechnical axial design methodology for Colorado’s drilled shafts socketed in weak rocks. Colorado Department of Transportation, Research Final Report CDOT-DTD-R-2003-6; 2003.
2. Nusairat J, Liang RY, Engel RL. Design of rock socketed drilled shafts. Ohio Department of Transportation Research Final Report FHWA/OH-2006/21; 2006.
3. Kansas Department of Transportation. Bridge construction manual; 2011.
4. Geostatistics for natural resources evaluation;Goovaerts,1997
5. Probabilistic foundation settlement on spatially random soil;Fenton;J Geotech Geoenviron, ASCE,2002