Institution: | (1) Institute f. Informationsverarbeitung, Technical University of Graz, Schießstattgasse 4A, A-8010 Graz, Austria;(2) Computer Science Department, Cornell University, 14853 Ithaca, NY;(3) Present address: Department of Computer Science, University of Illinois, 1304 West Springfield Ave., 61801 Urbana, IL |