1. Shutian Fan and Su-fei Meng: Machinery Design & Manufacture, (in China, 2007, 6) pp.82-84.
2. Yu-hong Ren, Research of process and equipment for three roller plate coiling of level adjust below [D], Tianjin University, Department of Mechanical Manufacturing and Automation, (2006).
3. Zhong-cai Wei: Zhongzhou coal(in China, 2006, 5) pp.26-27.
4. Hong-wen Liu: mechanics of materials(in China, Higher Education Press, 2000).
5. F. Williamson. Jr.: A Historical Note on the Finite Element Method, International Journal for Numerical Methods in Engineering, Vol. 15, No. 6, 1980, pp.930-934.