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==References==
 
==References==
 
<references />
 
<references />
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[http://www.jce.divched.org/Journal/Issues/1998/Jun/abs719.html] [http://www.jce.divched.org/Journal/Issues/1998/Jun/PlusSub/V75N06/p719.pdf]
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[http://www.jce.divched.org/Journal/Issues/1998/Jun/abs719.html]
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[http://www.jce.divched.org/Journal/Issues/1998/Jun/PlusSub/V75N06/p719.pdf]
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