1. Statnamic load testing of foundation piles;Middendorp,1992
2. Anandarajah A. hopdyne: a finite element computer program for the analysis of static, dynamic and earthquake soil and soil–structure systems. Civil Engineering Report, Johns Hopkins Universit; 1990.
3. Idriss IM, Lysmer J, Hwang R, Seed HB. Quad4: a computer program for evaluating the seismic response of soil structures by variable damping finite element procedure. Berkeley report no. EERC 73-16, University of California; 1973.
4. Finite elements for foundations, joints and fluids;Wilson,1977