Santanu Bhowmick, Kasturi Varadarajan, Shi-Ke Xue. A constant-factor approximation for multi-covering with disks. In Guilherme Dias da Fonseca, Thomas Lewiner, Luis Mariano Peñaranda, Timothy Chan, Rolf Klein, editors, Symposuim on Computational Geometry 2013, SoCG '13, Rio de Janeiro, Brazil, June 17-20, 2013. pages 243-248, ACM, 2013. [doi]
Abstract is missing.