Affiliation: | (1) AT&T Labs-Research, 180 Park Avenue, Florham Park, NJ 07932, USA;(2) Department of Computer Science, Massachusetts Institute of Technology, Cambridge, MA 02139, USA;(3) Department of Computer Science, Duke University, Durham, NC 27708-0129, USA;(4) Mindmaker Ltd., Konkoly Thege M. u. 29-33, Budapest, 1121, Hungary |