Leading white space before the "http:" is apparently treated as a
relative link at least by some browsers.
</biblioentry>
<biblioentry>
- <title><ulink url=" http://www.redbooks.ibm.com/abstracts/sg245674.html?Open">Developing and Porting C and C++ Applications on AIX</ulink></title>
+ <title><ulink url="http://www.redbooks.ibm.com/abstracts/sg245674.html?Open">Developing and Porting C and C++ Applications on AIX</ulink></title>
<publisher>
<publishername>IBM Redbook</publishername>
</publisher>