Add Ledlie, Seltzer paper

www/doc/expubs.html

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    EMULAB-COPYRIGHT
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@@ -21,6 +21,16 @@ Distributed Systems (SRDS)</cite>, Orlando, FL, Oct. 2005.
 </li>
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+<li>
+<span>
+Jonathan Ledlie and Margo Seltzer <a
+href="http://www.eecs.harvard.edu/~jonathan/lb/">
+"Distributed, Secure Load Balancing with Skew, Heterogeneity, and Churn"</a>
+In <cite>Proceedings of IEEE INFOCOM 2005</cite>, March 2005.
+</span>
+</li>
+<br>
+
 <li>
 <span>
 J. Mirkovic, S. Dietrich, D. Dittrich, and P. Reiher, "Internet Denial of