@TECHREPORT\{IMM1987-0340, author = "H. Juel and R. F. Love", title = "A localization property for facility location problems with arbitrary norms", year = "1987", number = "", series = "{IMSOR} Research Report 24/1987", institution = "Institute of Mathematical Statistics and Operations Research, Technical University of Denmark", address = "", type = "", url = "http://www2.compute.dtu.dk/pubdb/pubs/340-full.html" }