 <a name="tr900"> Ramalingam, G. and Reps, T.,</a> Semantics of program representation graphs. TR-900, Computer Sciences Department, University of Wisconsin-Madison, December 1989. (Click <A HREF="http://www.cs.wisc.edu/Dienst/UI/2.0/Describe/ncstrl.uwmadison%2fCS-TR-89-900">here</A> to access paper.) <p>
