@techreport{
    Hollmen97b,
    author = "Hollm\'en, Jaakko",
    language = "eng",
    responsibleperson = "Jaakko Hollm\'en",
    title = "Novelty Filter for Fraud Detection in Mobile Communications Networks",
    url = "http://www.cis.hut.fi/jhollmen/Publications/Hollmen-TechRep-A4.ps",
    optnote = "",
    optaddress = "",
    opttype = "",
    number = "A48",
    month = "October",
    optannote = "",
    flags = "RAE",
    optkey = "",
    year = "1997",
    imapactfactor = "E",
    institution = "Helsinki University of Technology, Laboratory of Computer and Information Science"
}