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Source:
American Scientist. July-August, 2009, Vol. 97 Issue 4, p330, 3 p.
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Source:
American Scientist. July-August, 1995, Vol. 83 Issue 4, p383, 2 p.
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American Scientist. Sept-Oct, 2003, Vol. 91 Issue 5, p388, 3 p.
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Source:
American Scientist. May, 2001, Vol. 89 Issue 3, p262.
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