--- a/bsc-projects-13.html	Mon Sep 23 01:54:12 2013 +0100
+++ b/bsc-projects-13.html	Tue Sep 24 18:27:41 2013 +0100
@@ -105,7 +105,7 @@
   about the problem much longer than a single afternoon. The task 
   in this project is to find out how good they actually are by implementing the results from their paper. 
   Their approach is based on the concept of partial derivatives introduced in 1994 by
-  <A HREF="http://reference.kfupm.edu.sa/content/p/a/partial_derivatives_of_regular_expressio_1319383.pdf">Valentin Antimirov</A>.
+  <A HREF="http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.56.2509&rep=rep1&type=pdf">Valentin Antimirov</A>.
   I used them once myself in a <A HREF="http://www.inf.kcl.ac.uk/staff/urbanc/Publications/rexp.pdf">paper</A> 
   in order to prove the <A HREF="http://en.wikipedia.org/wiki/Myhill–Nerode_theorem">Myhill-Nerode theorem</A>.
   So I know they are worth their money. Still, it would be interesting to actually compare their results