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Sweep coverage term is recently introduced for coverage in wireless sensor networks. The criteria for sweep coverage is different from the traditional coverage problem where a continuous monitoring with sensor nodes is required. But in sweep coverage, periodic monitoring is sufficient with a small number of mobile sensor nodes. Finding minimum number of mobile sensor nodes with a constant velocity to guarantee sweep coverage is NP-hard and it cannot be approximated within a factor of 2 . Indoi:10.1109/comsnets.2014.6734885 dblp:conf/comsnets/GorainM14 fatcat:cbbw5qdnafapvdknv5qwmdiipe