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DTNs have emerged as an attractive networking paradigm for mobile networks where transmission links among mobile nodes are dynamically established or torn down and communication is accomplished through multi-hop message relaying. Such environments are becoming increasingly prevalent due to the rapid growth of heterogeneous mobile devices and delay-insensitive applications. A key problem in DTNs is the selection of relay nodes. The problem is unique in DTNs because relays are not necessarily determined before the transmission of packets by the source.
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