@ARTICLE\{IMM2005-04776,
    author       = "S. Bisgaard and M. Kulahci",
    title        = "Checking Process Stability with the Variogram",
    year         = "2005",
    pages        = "323-327",
    journal      = "Quality Engineering",
    volume       = "17",
    editor       = "",
    number       = "2",
    publisher    = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/4776-full.html"
}