References
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- M. Agranoff ,“ Letter to the Editor ,” EDP Auditor (Winter 1981 ).
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- L. Hoffman , Modern Methods for Computer Security and Privacy ( Englewood Cliffs NJ Prentice-Hal I , 1977 ).
- C. O'lGrady Steven Ross , “ Passwords Frequency of Change and its Impact on Data Security ,” Computer Security ( November/December 1977 ).