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In this book a distributed algorithm for coordinate- free Wireless Sensor Networks to elect a small subset of nodes achieving full coverage is introduced. To the best of the authors knowledge, this is the first time that a practical and efficient algorithm for electing a sub-optimal subset of nodes for full coverage is introduced only using connectivity information. It also provides an efficient way to detect accurate boundary of un-triangulated holes and recovery them in Wireless Sensor Networks. A distributed hole recovery (DHR) algorithm is also introduced, which is executed on...