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@@ -142,11 +142,11 @@ invocations.
 
 <H2 id="references">REFERENCES</H2>
 
-<p>The only reference you need for this stuff is &quot;Digital
-Halftoning&quot; by Robert Ulichney, MIT Press, ISBN 0-262-21009-6.
+<p>The only reference you need for this stuff is "Digital
+Halftoning" by Robert Ulichney, MIT Press, ISBN 0-262-21009-6.
 
-<P>The Hilbert curve space filling method is taken from &quot;Digital
-Halftoning with Space Filling Curves&quot; by Luiz Velho, Computer
+<P>The Hilbert curve space filling method is taken from "Digital
+Halftoning with Space Filling Curves" by Luiz Velho, Computer
 Graphics Volume 25, Number 4, proceedings of SIGRAPH '91, page
 81. ISBN 0-89791-436-8