@ARTICLE\{IMM2003-0717,
    author       = "A. Christensen and H. Melgaard and J. Iwersen and P. Thyregod",
    title        = "Determination of Control limits for environmental monitoring in cleanrooms based on a hierarchical Poisson-Gamma model.",
    year         = "2003",
    pages        = "275-285",
    journal      = "Journal of Quality Technology",
    volume       = "35",
    editor       = "",
    number       = "",
    publisher    = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/717-full.html"
}