Sergei Bespamyatnikh Binay K. Bhattacharya David G. Kirkpatrick Michael Segal Mobile facility location. 46-53 2000 conf/dialm/2000 DIAL-M http://doi.acm.org/10.1145/345848.345858 db/conf/dialm/dialm2000.html#BespamyatnikhBKS00