1. Applications of approximate reasoning in risk analysis,1986
2. Fuzzy Set Theory and Its Applications;Zimmermann,1985
3. Fuzzy Sets and Systems, Theory and Applications;Dubois,1980
4. China National Standard, Standard for Welded Butt in X-ray Examination in Qualification Test, GB 3323-87. Xu Yuan Publishing House, Beijing.
5. Standard for Assessment of Safety of Pressure Vessels Containing Defects, CVDA-84. The Chinese Society of Pressure Vessels Technology, Hefei, China.