[1] AT and T Labs-Research, United States
[2] University of Konstanz, Germany
[3] University of Rome La Sapienza, Italy
[4] University of Colorado, Boulder, United States
[5] Carleton University, Canada
[6] Max Planck Institute for Computer Science, Germany
[7] University of Pittsburgh, United States
[8] Brown University, United States
[9] INRIA, Sophia Antipolis, France
[10] University of Texas, Austin, United States
[11] University of Aarhus, Denmark
[12] University of Tronto, Canada
[13] Microsoft Research
[14] University of California, Irvine, United States
[15] University of Rome Tor Vergata, Italy
[16] University of Washington, United States
[17] Amherst College, United States
[18] University of New Mexico, United States
[19] University of Maryland, College Park, United States
[20] University of North Carolina, Chapel Hill, United States
[21] Columbia University, United States