References
Kurtenbach, Sellen, and Buxton, Some Articulartory and Cognitive Aspects of “Marking Menus”, Graphics Interface ‘94, http://reality.sgi.com/gordo_tor/papers
Kurtenbach and Buxton, User Learning and Performance with Marking Menus, Graphics Interface ‘94, http://reality.sgi.com/gordo_tor/papers
Jain, The art of computer systems performance analysis, Wiley, 1991
http://www.statsoft.com/textbook/stanman.html
Gonick and Smith, The Cartoon Guide to Statistics, HarperPerennial, 1993