1. 2) HIJIKATA K. Dynamic characteristics of pile groups in non-homogenous soil. Proc. 10th European Conference on Earthquake Engineering. (1994) p.661-666.
2. 5) HIJIKATA K. A Study on the Practical Methods for Group Factor of Piles. Proc. 11th WCEE. (1996)
3. 6) KOYAMA K. Seismic Response Analysis of Thermal Power Plant Supported by a Large Number of Piles. Proc. 11th WCEE. (1996)
4. 8) WASS G. Seismic Analysis of Pile Foundation Including Pile-Soil-Pile Interaction. Proc. 8th WCEE. (1984) vol.Vol.5, p.55-62.
5. 9) KAYNIA A. M. Dynamic Stiffness and Seismic Response of Pile Groups, PH. D.Thesis submitted to the Department of Civil Engineering. M. I. T.. (1982)