Index: trunk/doc/release.2015/ps1.datasystem/Makefile
===================================================================
--- trunk/doc/release.2015/ps1.datasystem/Makefile	(revision 39888)
+++ trunk/doc/release.2015/ps1.datasystem/Makefile	(revision 39975)
@@ -2,5 +2,5 @@
 
 DO_PDFLATEX = 1
-DO_BIBTEX = 0
+DO_BIBTEX = 1
 
 help: