Item from Mathematical Reviews (American Mathematical Society)--access
their stable url through the AMS database via an institutional library:
MR2035987 (2004k:90065) Brimberg, Jack; Kakhki, H. Taghizadeh;
Wesolowsky, George O. Location among regions with varying norms.
Facility location modelling: papers in honor of Kenneth E. Rosing, Part
I. Ann. Oper. Res. 122 (2003), 87--102. (Reviewer: Sandra L.
Arlinghaus) 90B85 (90C30)