Ahmad Biniaz, Anil Maheshwari, Michiel H. M. Smid, Paul Liu. A Faster 4-Approximation Algorithm for the Unit Disk Cover Problem. In Proceedings of the 27th Canadian Conference on Computational Geometry, CCCG 2015, Kingston, Ontario, Canada, August 10-12, 2015. Queen's University, Ontario, Canada, 2015. [doi]
Abstract is missing.