Cedric Adjih Leonidas Georgiadis Philippe Jacquet Wojciech Szpankowski Multicast tree structure and the power law. 1508-1521 2006 52 IEEE Transactions on Information Theory 4 http://doi.ieeecomputersociety.org/10.1109/TIT.2006.871602 db/journals/tit/tit52.html#AdjihGJS06