Item from Mathematical Reviews (American Mathematical Society)--access
their stable url through the AMS database via an institutional library:
MR2179976 (2006e:90058) Arriola, Rosario; Laporte, Gilbert; Ortega,
Francisco A. The Weber problem in a multi-storey building. INFOR Inf.
Syst. Oper. Res. 43 (2005), no. 3, 157--169. (Reviewer: Sandra L.
Arlinghaus) 90B80 (90C90)