Mini-Unix/usr/doc/new/memo6

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References
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1. K.Thompson and D. M. Ritchie, "The UNIX Time-Sharing System",
Comm. ACM 17, (July 1974), p365.
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2. D. M. Ritchie, "C Reference Manual", TM-74-1273-1.
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3. H. Lycklama, "The LSI-UNIX System", TM-76-1352-4.
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4. K. Thompson and D. M. Ritchie, "UNIX Programmer's Manual - 6th Edition",
May, 1975.