1. Banerjee P. K. and Davies T. G. (1977). “Analysis of pile groups embedded in Gibson soil.” Proc. 9th Int. Conf. Soil Mechs. Found. Engrg. Tokyo Japan vol. 1 381–386.
2. O'Neill M. W. Ghazzaly O. I. and Ha H. B. (1977). “Analysis of three‐dimensional pile groups with nonlinear soil response and pile‐soil‐pile interaction.” Proc. 9th Annual Offshore Tech. Conf. (Paper No. OTC 2838) Houston Tex. May.
3. O'Neill M. W. Hawkins R. A. and Mahar L. J. (1981). “Field study of pile group action.” Rep. No. FHWA/Rd‐81/002 Federal Highway Administration Washington D.C.
4. Poulos H. G. and Davis E. H. (1980). Pile foundation analysis and design . John Wiley and Sons New York N.Y.
5. An analysis of the vertical deformation of pile groups