Christina Aperjis Michael J. Freedman Ramesh Johari A Comparison of Bilateral and Multilateral Exchanges for Peer-Assisted Content Distribution. 1-8 2008 NET-COOP http://dx.doi.org/10.1007/978-3-642-00393-6_1 conf/netcoop/2008 db/conf/netcoop/netcoop2008.html#AperjisFJ08