diff --git a/list.tex b/list.tex
index 7f849bb..bd9842f 100644
--- a/list.tex
+++ b/list.tex
@@ -270,9 +270,6 @@
   An $O(n \log n)$ algorithm for finding all repetitions in a string.
   \emph{Journal of Algorithms}, 5(3):422--432, 1984.
 
-\bibitem{main}
-  Młodzieżowa Akademia Informatyczna (MAIN), \texttt{http://main.edu.pl/}
-
 % \bibitem{ore60}
 %   Ø. Ore.
 %   Note on Hamilton circuits.
@@ -332,6 +329,9 @@
   \emph{Programming Challenges: The Programming Contest Training Manual},
   Springer, 2003.
 
+\bibitem{main}
+  SZKOpuł, \texttt{https://szkopul.edu.pl/}
+
 \bibitem{spr35}
   R. Sprague.
   Über mathematische Kampfspiele.