Wenhao Shu A Fast Algorithm for Facility Location Problem. 2360-2366 2013 8 J. Softw. 9 https://doi.org/10.4304/jsw.8.9.2360-2366 http://www.jsoftware.us/index.php?m=content&c=index&a=show&catid=88&id=1445 db/journals/jsw/jsw8.html#Shu13