1. Andonyadis M. Altschaeffl A. G. and Chameau J. L. (1985). “Fuzzy sets in pavement evaluation and management: Application and interpretation.” FHWA/IN/JHRP Report # 85‐14 School of Civil Engineering Purdue University West Lafayette Ind.
2. A review of some methods for ranking fuzzy subsets
3. Chang S. C. (1985). “Case study on geological disasters in slope land of Taiwan.” Science Report 12 Department of Geography National Taiwan University Taipei Taiwan 63–122.
4. Chen S. Z. Hu L. J. and Chen G. H. (1988). “The investigation and remedy on the slope failure of Mt. So‐San.” Hazard Mitigation Report No. 77‐12 National Science Council Taiwan Republic of China (in Chinese).