--- a/doc-src/Ref/ref.bbl Tue Sep 24 09:02:34 1996 +0200
+++ b/doc-src/Ref/ref.bbl Tue Sep 24 13:51:10 1996 +0200
@@ -28,6 +28,12 @@
\newblock In Mark~E. Stickel, editor, {\em 10th International Conference on
Automated Deduction}, LNAI 449, pages 366--380. Springer, 1990.
+\bibitem{nipkow-patterns}
+Tobias Nipkow.
+\newblock Functional unification of higher-order patterns.
+\newblock In M.~Vardi, editor, {\em Eighth Annual Symposium on Logic in
+ Computer Science}, pages 64--74. {\sc ieee} Computer Society Press, 1993.
+
\bibitem{nipkow-prehofer}
Tobias Nipkow and Christian Prehofer.
\newblock Type reconstruction for type classes.