1. Youshu, Q., Yongsheng, Y., Huagong, C.: Categorizing of Versions in Engineering Design and a Data Model for Management of Product Versions. Journal of Huazhong University of Science and Technology 26(8) (1998)
2. Meilin, S.: Computer Supported Collaborative Work- Theory and Practice (12), 277 (2000), ISBN 7-5053-6293-3 TP 3398
3. Jian, C., Youliang, Z., Haiyang, Z.: Version Management for Collaborative Design. Computer Integrated Manufacturing Systems, CIMS (6), 16–20 (1998)
4. Haskin, R.L., Lorie, R.A.: On extending the functions of a relational database system. In: Proceedings of the ACM SIGMOD Conference, May 1982, pp. 207–212. ACM, New York (1982)
5. Mcleod, D., Narayanaswamy, K., Bapa Rao, K.: An approach to information management for CAD/VLST applications. In: Proceedings of the SIGMOD conference on Databases for Engineering Applications, San Jose,Calif, May 1983, pp. 39–50. ACM, New York (1983)