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- [4] ISDN REQUIREMENTS AND THEIR SOLUTIONS IN THE EWSD SYSTEM. Telcom Report (English Edition), 1983, 6 (05): : 201 - 206
- [6] ISDN digital switching system and transmission system Hitachi Review, 1991, 40 (03): : 235 - 240
- [7] ISDN SWITCHING SYSTEM HARDWARE. Denki Tsushin Kenkyujo kenkyu jitsuyoka hokoku, 1987, 36 (08): : 977 - 983
- [8] TELECOM CHIPS FOR THE HICOM ISDN COMMUNICATION SYSTEM. Telcom Report (English Edition), 1986, 9 (01): : 43 - 46
- [10] ISDN SWITCHING SYSTEM SOFTWARE ARCHITECTURE. Denki Tsushin Kenkyujo kenkyu jitsuyoka hokoku, 1987, 36 (08): : 985 - 994