A Polynomial Time Approximation Scheme for Minimum Cost Delay-Constrained Multicast Tree under a Steiner Topology.

Guoliang Xue Wei Xiao A Polynomial Time Approximation Scheme for Minimum Cost Delay-Constrained Multicast Tree under a Steiner Topology. 53-72 2004 41 Algorithmica 1 http://dx.doi.org/10.1007/s00453-004-1119-9 db/journals/algorithmica/algorithmica41.html#XueX04