Change recipe to build qua.
diff --git a/Doc/Makefile b/Doc/Makefile
index 763a434..1011bef 100644
--- a/Doc/Makefile
+++ b/Doc/Makefile
@@ -18,9 +18,9 @@
 
 qua:
 	latex qua
-	latex qua
 	bibtex qua
 	latex qua
+	latex qua
 
 clean:
 	rm -f @* *~ *.aux *.dvi *.idx *.ilg *.ind *.log *.ps *.toc