1. Elastic Analysis of Soil-Foundation Interaction;Selvadurai,1979
2. A perturbation-Galerkin method for the analysis of beams resting on nonlinear elastic foundations;Soldatos,1983
3. Energy Methods in Applied Mechanics;Langhaar,1962
4. Variational Methods in Elasticity and Plasticity;Washizu,1974
5. Finite beam-columns on elastic foundation;Iyengar,1963