diff --git a/biblio.bib b/biblio.bib
index ef1ce6068b117732fc7f4ee9c7271327b93aa84a..474d8bdfa48158f9b1c379c7e72623911b29b100 100644
--- a/biblio.bib
+++ b/biblio.bib
@@ -145,7 +145,7 @@
 	JOURNAL = "Numerische Mathematik",
 	VOLUME = 1,
 	PAGES = {269--271},
-	URL = "http://gdzdoc.sub.uni-goettingen.de/sub/digbib/loader?did=D196313",
+	URL = "https://ir.cwi.nl/pub/9256/9256D.pdf",
 	filesize = {256 KB},
 }