@phdthesis{
    HUT-TCS-A25,
    author = {{\"O}sterg{\aa}rd, Patric R. J.},
    institution = "Helsinki University of Technology, Department of Computer Science and Engineering, Digital Systems Laboratory",
    title = "Construction Methods for Covering Codes",
    year = "1993",
    number = "A25",
    month = "September",
    note = "Doctoral dissertation",
    address = "Espoo, Finland",
    owner = "MM",
    type = "Research Report",
    pages = "25"
}