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2. Cashman Paul M. MONSTR User's Reference Manual. Massachusetts Computer Associates document CA-7911-0101. November 1979. Cashman Paul M. MONSTR User's Reference Manual . Massachusetts Computer Associates document CA-7911-0101. November 1979.
3. Digital Equipment Corporation. TOPS-20AN User's Guide (Chapter 4: Local and Network Mail). Order numbers AA-5221A-TM AD-5221A-T1. May 1979. Digital Equipment Corporation. TOPS-20AN User's Guide (Chapter 4: Local and Network Mail). Order numbers AA-5221A-TM AD-5221A-T1. May 1979.
4. Fisher David A. "DoD's Common Programming Language Effort." IEEE Computer pp. 24--33. March 1978. Fisher David A. "DoD's Common Programming Language Effort." IEEE Computer pp. 24--33. March 1978.