1. Wei Yueguang, Calculation of the elasto-plastic problem of the elliptic tunnel by the perturbational method,Engineering Mechanics,7, 2 (1990), 93–102. (in Chinese)
2. Xie Zhicheng, Wang Reiwu, Yang Xuezhong and Chien Zhendong, The perturbational finite element method used in the physically nonlinear problems,Applied Methematics and Mechanics (English Ed.),4, 1 (1983), 127–142.
3. Cao Zhiyuan, Advance of the combination method of analytic and numerical solutions,Proceeding of the First Conference of the Combination Method of Analytic and Numerical Methods in China, Changsha (1990), 1–5, (in Chinese)
4. C. A. Brabbie and S. Voke,The Engineering Application of the Boundary Element Method, Translated by Long Shuyao, et al., Shanxi Sciences and Techniques Press (1980), 118–207. (Chinese version)