Doc Fix. Correct link to Zephyr ASDL Abstract page.
diff --git a/Parser/asdl.py b/Parser/asdl.py
index c55038d..7f5856b 100644
--- a/Parser/asdl.py
+++ b/Parser/asdl.py
@@ -1,7 +1,7 @@
"""An implementation of the Zephyr Abstract Syntax Definition Language.
See http://asdl.sourceforge.net/ and
-http://www.cs.princeton.edu/~danwang/Papers/dsl97/dsl97-abstract.html.
+http://www.cs.princeton.edu/research/techreps/TR-554-97
Only supports top level module decl, not view. I'm guessing that view
is intended to support the browser and I'm not interested in the