Gruia Calinescu, Guy Kortsarz, Zeev Nutov. Improved Approximation Algorithms for Minimum Power Covering Problems. In Leah Epstein, Thomas Erlebach, editors, Approximation and Online Algorithms - 16th International Workshop, WAOA 2018, Helsinki, Finland, August 23-24, 2018, Revised Selected Papers. Volume 11312 of Lecture Notes in Computer Science, pages 134-148, Springer, 2018. [doi]