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)