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- [3] DEVELOPMENT AND PRODUCTION OF THE AMBASSADOR ELECTRONIC PLAN SYSTEM. Post Office Electrical Engineers Journal, 1982, 74 (pt 4): : 352 - 358
- [4] ELECTRONIC TOKEN SYSTEM. Quarterly Report of RTRI (Railway Technical Research Institute) (Japan), 1986, 27 (02): : 56 - 60
- [6] ELECTRONIC MAIL SYSTEM. Japan Annual Reviews in Electronics, Computers & Telecommunications, 1984, 14 : 239 - 245