--- a/compalg.xml
+++ b/compalg.xml
@@ -1,13 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <?xml-stylesheet type="text/xsl" href="main.xsl"?>
-<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
 <html xmlns="http://www.w3.org/1999/xhtml" id="compalg" xml:lang="en">
-<head>
-    <title>Other Open Source Computer Algebra Systems</title>
-    <link rel="schema.DC" href="http://purl.org/dc/elements/1.1/"/>
-    <link rel="schema.DCTERMS" href="http://purl.org/dc/terms/"/>
-    <meta name="DC.identifier" scheme="DCTERMS.URI" content="http://maxima.sourceforge.net/compalg.html"/>
-</head>
+<head><title>Other Open Source Computer Algebra Systems</title></head>
 <body>
 
 <div class="catit">
@@ -30,11 +24,6 @@
 </div>
 
 <div class="catit">
-<h3><a href="http://reduce-algebra.com">REDUCE</a></h3>
-<p>“REDUCE is an interactive system for general algebraic computations of interest to mathematicians, scientists and engineers.”</p>
-<p class="url">→ <a href="http://reduce-algebra.com">http://reduce-algebra.com</a></p></div>
-
-<div class="catit">
 <h3><a href="http://www.singular.uni-kl.de/">SINGULAR</a></h3>
 <p>“SINGULAR is a Computer Algebra System for polynomial computations with special emphasis on the needs of commutative algebra, algebraic geometry, and singularity theory.”</p>
 <p class="url">→ <a href="http://www.singular.uni-kl.de/">http://www.singular.uni-kl.de/</a></p></div>
@@ -46,11 +35,6 @@
 </div>
 
 <h2>Other Open Source Mathematical Software</h2>
-
-<ul>
-  <li>Oberwolfach References on Mathematical Software: <a href="http://orms.mfo.de/">http://orms.mfo.de/</a></li>
-  <li>Free mathematical and computational software directory: <a href="http://cadadr.org/fm/">http://cadadr.org/fm/</a></li>
-</ul>
 
 <div class="catit">
 <h3><a href="http://www.mathematik.uni-muenchen.de/~forster/sw/aribas.html">ARIBAS</a></h3>