Weizhan Zhang Qinghua Zheng Yang Li Yi Che LDCOM: a Layered degree-constrained overlay multicast for interactive media. 1147-1152 2008 ISCC http://dx.doi.org/10.1109/ISCC.2008.4625747 conf/iscc/2008 db/conf/iscc/iscc2008.html#ZhangZLC08