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* [{{cite web|archive-url=https://web.archive.org/web/20060711174833/http://www.psych.umn.edu/psylabs/catcentral/|title=CAT Central] by |first=David J.|last=Weiss|archive-date=11 July 2006|url=http://www.psych.umn.edu/psylabs/catcentral/|url-status=dead}}
