Copyright date.

diff --git a/v7/src/runtime/wttree.scm b/v7/src/runtime/wttree.scm
index 13190f92ad8e9116ecd13afdac60bd3b8807c41c..e045dc59532ad1d72a77858bf579c7109b1ecd5e 100644 (file)
--- a/v7/src/runtime/wttree.scm
+++ b/v7/src/runtime/wttree.scm
@@ -1,8 +1,8 @@
 #| -*-Scheme-*-
 
-$Id: wttree.scm,v 1.4 1994/09/19 20:39:49 adams Exp $
+$Id: wttree.scm,v 1.5 1994/11/14 18:51:26 adams Exp $
 
-Copyright (c) 1988-93 Massachusetts Institute of Technology
+Copyright (c) 1993-94 Massachusetts Institute of Technology
 
 This material was developed by the Scheme project at the Massachusetts
 Institute of Technology, Department of Electrical Engineering and
@@ -32,6 +32,17 @@ Technology nor of any adaptation thereof in any advertising,
 promotional, or sales literature without prior written consent from
 MIT in each case. |#
 
+#|
+Copyright (c) 1993-1994 Stephen Adams
+
+Any copy of this software must include this copyright notice in full.
+This is a derived work based on the following reference:
+
+  Stephen Adams, Implemeting Sets Efficiently in a Functional
+     Language, CSTR 92-10, Department of Electronics and Computer
+     Science, University of Southampton, 1992
+|#
+
 ;;;; Weight-balanced tree (wt-tree) Operations
 ;;; package: (runtime wt-tree)