@CONFERENCE\{IMM1998-01677,
    author       = "N. C. Albertsen",
    title        = "A transition function for a vertex diffracted ray",
    year         = "1998",
    pages        = "445-448",
    booktitle    = "{JINA,} Nice, November",
    volume       = "",
    series       = "",
    editor       = "",
    publisher    = "",
    organization = "",
    address      = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/1677-full.html"
}