1. Kaynia AM. Dynamic stiffness and seismic response of pile groups. Research Report R82-03, Masshachussetts Institute of Technology, 1982.
2. Waas G, Hartmann HG. Seismic analysis of pile foundations including soilâpileâsoil interaction. Proceedings of the 8th World Conference on Earthquake Engineering, San Francisco, July 1984; 555â562.
3. Ring-pile analysis for a grouped pile foundation subjected to base motion;Takemiya;Structural Engineering/Earthquake Engineering,1986
4. Ohira A, Tazoh T, Dewa T, Shimizu K, Shimada M. Observation of earthquake response behaviours of foundations piles for road bridge. Proceedings of the 8th World Conference on Earthquake Engineering, San Francisco, vol. 3, July 1984; 577â584.