@masterthesis{18249,
    title = "Operator surveillance and billing in 5G D2D systems",
    author = "Μπούτος, Αναστάσιος Ν.",
    year = "2017",
    school = "Τμήμα Πληροφορικής και Τηλεματικής, Χαροκόπειο Πανεπιστήμιο"
}