9Lin Ying,A practical method of Design for Building Base isolation by means of Rigid Spheres with Restoring Property,US/PRC Workahop on Base Isolation and Passive Energy Absorption.San Francisco,USA,May 1990.
10Qiang Zhou,Xilin Lu,Qingmin Wang,Dingguo Feng,Qianfeng Yao,Dynamic Analysis on Structures Rase-isolated by a Ball System with Restoring Property,Earthquake Enginecring and Structural Dynamics,V.27,PP773-791(1998).
