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2. UNIX system security for system administrators;Alford,1988
3. v05i059: pwgen—random but pronounceable password generator;Allbery;USENET posting in comp.sources.misc,1988
4. A framework for password selection;Alvare;USENIX UNIX Security Workshop Proceedings,1988
5. UNIX password security;Anderson;USENIX UNIX Security Workshop Proceedings,1988