1. School of Mathematics and Physics, The University of Queensland, St Lucia, QLD, Australia
2. Department of Computer Science, Dartmouth College, Hanover, NH, USA
3. Department of Information and Computing Sciences, Utrecht University, Utrecht, The Netherlands
4. DataShape Research Group, INRIA Sophia Antipolis-Méditerranée, Sophia Antipolis, France
5. Laboratoire d’Informatique Gaspard Monge, Marne-la-Vallée Cedex 2, France
6. Mathematics Institute, University of Warwick, Coventry, UK
7. School of Computing, DePaul University, Chicago, IL, USA
8. School of Mathematics and Statistics F07, The University of Sydney, NSW, Australia