Link to original parser combinators document for the clean programming language.

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@@ -7,7 +7,9 @@
     <h1>Parsers</h1>
 <p class="note">The parser combinator library described here is based
   on a library written for the Clean pure functional programming language and
-  described in chapter 5 of the 'Clean Book'. Based on the description
+  described in chapter 5 of the 'Clean Book' (<a
+  href="ftp://ftp.cs.kun.nl/pub/Clean/papers/cleanbook/II.05.ParserCombinators.pdf">PDF
+  available here</a>). Based on the description
   in that chapter I developed a version for Factor, a concatenative
   language.</p>  
 <p>A parser is a word or quotation that, when called, processes