Laurent Viennot Yacine Boufkhad Fabien Mathieu Fabien de Montgolfier Diego Perino Scalable Distributed Video-on-Demand: Theoretical Bounds and Practical Algorithms http://arxiv.org/abs/0804.0743 2008 CoRR abs/0804.0743 db/journals/corr/corr0804.html#abs-0804-0743 informal publication