ACM Copyright

ACM, 2012. This is the authors version of the work. It is posted here by permission of ACM for your personal use. Not for redistribution. The definitive version was published in PODC'12, Copyright 2012 ACM 978-1-4503-1450-3/12/07. http://dx.doi.org/10.1145/2332432.2332443

Joanne Talbot Hanley

Last modified: Fri Jul 20 14:21:17 EDT 2012