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== External links ==
*[http://www.unc.edu/~rowlett/units/dictR.html Dictionary of Physics Units of Measurement]{{Dead link|date=May 2020}}
*[http://www.sizes.com/units/rayl.htm A discussion of the history and ambiguity of the rayl]
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