Area coverage is one of the key issues for wireless sensor networks. It aims at selecting a minimum number of sensor nodes to cover the whole sensing region and maximizing the lifetime of the network. In this paper. we discuss the energy-efficient area coverage problem considering boundary effects in a new perspective. https://www.markbroyard.com/limited-time-depileve-easy-clean-wax-warmer-cleaner-220-ml-discount-top-mega/