1. J. Cheng, Z. Yang, Applying fuzzy synthetic decision-making system in determining the operating condition of mining machinery, Proceedings of International Mining Technology, Shanghai, China, 1997.
2. Z. Yang, J. Cheng, Application of debris group analysis theory in arranging the importance sequence of severe wear particles, Proceedings of International Conference on Plant Engineering, Guangzhou, China, 1997.
3. J. Cheng, Z. Peng, T.B. Kirk, Wear particle analysis in ferrography for machine condition monitoring, Proceedings of International Conference on Plant Engineering, Guangzhou, China, 1997.
4. Z. Yang, J. Cheng, Application of debris group analysis theory in failure prediction, Proceedings of International Conference on Condition Monitoring, Xi'an, China, 1997.
5. Z. Yang, X. Wang, The significance of debris group to ferrography, Proceedings of 95' National Plant Diagnosis Symposium, Wuhan, China, 1995.