@CONFERENCE\{IMM1997-02711,
    author       = "A. H. Nielsen and K. O. H. Pedersen and N. K. Poulsen",
    title        = "Estimating the Short-Circuit Impedance",
    year         = "1997",
    pages        = "453-457",
    booktitle    = "32nd University Power Engineering Conference  UPEC97",
    volume       = "1",
    series       = "",
    editor       = "",
    publisher    = "",
    organization = "",
    address      = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/2711-full.html"
}