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In this paper, we study the problem of QoS group communication in a heterogeneous network, which consists of multiple MANETs attached to the backbone Internet. We propose a heuristic multicast algorithm called DD VMA (delay and delay variation multicast algorithm). DDVMA is designed for solving the DVBMT (delay- and delay variation-bounded multicast tree) problem (G.N. Rouskas and I. Baldine, 1997),...