Research sponsored by the INRIA, the Defense Advanced Research Projects Agency, and Rome Laboratory, Air Force Materiel Command, USAF, under agreement number F30602-97-2-0031, and by the National Science Foundation under Grant No. CCR-9357792. The U.S. Government is authorized to reproduce and distribute reprints for Governmental purposes notwithstanding any copyright annotation thereon.
The views and conclusions contained herein are those of the authors and should not be interpreted as necessarily representing the official policies or endorsements, either expressed or implied, of INRIA, the Defense Advanced Research Projects Agency Rome Laboratory, or the U.S. Government.
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