Ran Libeskind-Hadas Dominic Mazzoni Ranjith Rajagopalan Tree-Based Multicasting in Wormhole-Routed Irregular Topologies. 244-249 1998 IPPS/SPDP http://csdl.computer.org/dl/proceedings/ipps/1998/8403/00/84030244.pdf db/conf/ipps/ipps1998.html#Libeskind-HadasMR98