Matthew Andrews Mohammad Taghi Hajiaghayi Howard J. Karloff Ankur Moitra Capacitated Metric Labeling. 976-995 2011 SODA http://www.siam.org/proceedings/soda/2011/SODA11_075_andrewsm.pdf conf/soda/2011 db/conf/soda/soda2011.html#AndrewsHKM11