1. Multi cover of a polygon minimizing the sum of areas;Abu-Affash,2011
2. Weighted geometric set multi-cover via quasi-uniform sampling;Bansal,2012
3. A note on multicovering with disks;Bar-Yehuda;Comput. Geom.,2013
4. A constant-factor approximation for multi-covering with disks;Bhowmick,2013