Item from Mathematical Reviews (American Mathematical Society)--access their stable url through the AMS database via an institutional library:

MR1876921 (2002j:90031) Berman, Oded; Drezner, Zvi; Wesolowsky, George O. The collection depots location problem on networks. Naval Res. Logist. 49 (2002), no. 1, 15--24. (Reviewer: Sandra L. Arlinghaus) 90B80 (68R05 90C10)