Vijay Arya Naveen Garg Rohit Khandekar Adam Meyerson Kamesh Munagala Vinayaka Pandit Local search heuristic for k-median and facility location problems. 21-29 2001 conf/stoc/2001 STOC http://doi.acm.org/10.1145/380752.380755 db/conf/stoc/stoc2001.html#AryaGKMP01