@ARTICLE\{IMM1986-0281, author = "H. Juel and R. F. Love", title = "A geometrical interpretation of the existing facility solution condition for the Weber problem", year = "1986", pages = "1129-1131", journal = "The Journal of the Operational Research Society", volume = "37", editor = "", number = "", publisher = "", url = "http://www2.compute.dtu.dk/pubdb/pubs/281-full.html" }