1. Chong M. Density changes of sand on cone penetration resistance. In: Proceedings of the first international symposium on penetration testing ISOPT-1; 1988. p. 707–14.
2. White D. An investigation into the behaviour of pressed-in piles. PhD thesis, University of Cambridge; 2002.
3. Dijkstra J, Broere W, Bezuijen A, Tol AFv. Density changes near an advancing displacement pile in sand. In: 2nd British geotechnical association international conference on foundations; 2008. p. 545–54.
4. Mechanisms of shaft friction in sand from instrumented pile tests;Lehane;J Geotech Eng,1994
5. An investigation of the effect of soil state on the capacity of driven piles in sands;Klotz;Géotechnique,2001