diff --git a/_requests_for_research/multiobjective-rl.html b/_requests_for_research/multiobjective-rl.html
index f1e420e..bedc641 100644
--- a/_requests_for_research/multiobjective-rl.html
+++ b/_requests_for_research/multiobjective-rl.html
@@ -16,7 +16,7 @@
 
 <p><i>Filter methods</i> are algorithms from multi-objective
 optimization that seek to generate a sequence of points, so that each
-one is not strictly dominated by a previous one (see <a href="http://home.agh.edu.pl/~pba/pdfdoc/Numerical_Optimization.pdf">Nocedal &amp;
+one is not strictly dominated by a previous one (see <a href="https://web.archive.org/web/20150501032342if_/http://home.agh.edu.pl:80/~pba/pdfdoc/Numerical_Optimization.pdf#page=454">Nocedal &amp;
     Wright</a>, chapter 15.4). </p>
 
 <p> Develop a filter method for RL that jointly optimizes a collection