1. Bee-gent homepage. Toshiba Co.,
http://www2.toshiha.co.jp/beegent/indexj.htm
2. Sakaguchi, K., Hiraoka, H., et al. Re-use of Parts Using Agents. Proceedings. of EcoDesign’99 Japan Symposium; 1991 December 10–11; Tokyo: 1999 (in Japanese).
3. Sakaguchi, K,, Hiraoka, H., et al. Using Network Agents for the Maintenance of Mechanical Parts through their Life Cycle. Proceedings of EcoDesign2000 Japan Symposium, 2000 December 13–15; Tokyo: 2000 (in Japanese).
4. Voyager homepage. Tomen Information Systems Co.,
http://www.tomen.co.jp/tisco/Voyager/