Muhammad Mukarram Bin Tariq Mostafa H. Ammar Ellen W. Zegura Message ferry route design for sparse ad hoc networks with mobile nodes. 37-48 2006 conf/mobihoc/2006 MobiHoc http://doi.acm.org/10.1145/1132905.1132910 db/conf/mobihoc/mobihoc2006.html#TariqAZ06