fix link to shorten paper

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-                       <A HREF="http://svr-www.eng.cam.ac.uk/~ajr/">A. J. Robinson</A> for his work on <A HREF="http://svr-www.eng.cam.ac.uk/~ajr/GroupPubs/Robinson94-tr156/index.html">Shorten</A>; his code and paper are a good starting point on some of the basic methods used by FLAC.  FLAC expands on the fixed predictors used in shorten.
+                       <A HREF="http://svr-www.eng.cam.ac.uk/~ajr/">A. J. Robinson</A> for his work on <A HREF="http://www-svr.eng.cam.ac.uk/reports/abstracts/robinson_tr156.html">Shorten</A>; his paper is a good starting point on some of the basic methods used by FLAC.  FLAC expands on the fixed predictors used in shorten.
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                        <A HREF="http://commsci.usc.edu/faculty/golomb.html">S. W. Golomb</A> and Robert F. Rice; their universal codes are used by FLAC's entropy coder.