added a pointer to helena in Wiedijk's list

diff --git a/helm/www/lambda_delta/implementation.html b/helm/www/lambda_delta/implementation.html
index ac2a2f5742305a334bc7a567c5d64f7f34cf7403..6fc317e77f9fde4a701e26cfc51b11011328d070 100644 (file)
--- a/helm/www/lambda_delta/implementation.html
+++ b/helm/www/lambda_delta/implementation.html
@@ -188,7 +188,7 @@ source code</a>)
           <ul>
             <li><span style="font-weight: bold;">2009-12.</span> Helena
 appears in&nbsp;F. Wiedijk's <a
- href="http://www.cs.ru.nl/%7Efreek/digimath/index.html">index of
+ href="http://www.cs.ru.nl/%7Efreek/digimath/index.html#helena">index of
 computer math systems</a>.</li>
           </ul>
         </li>