http://portal.acm.org/citation.cfm?id=362929.362947|
* http://portal.acm.org/citation.cfm?id=362929.362947 |
|
* http://portal.acm.org/citation.cfm?id=362929.362947 |
http://cs-exhibitions.uni-klu.ac.at/fileadmin/template/documents/text/p147-salton.pdf http://web.archive.org/web/20070703050443/http://www.acm.org/classics/oct95/ http://portal.acm.org/citation.cfm?id=362929.362947 http://www.computerhistory.org/timeline/timeline.php?timeline_year=1968
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