@BOOK\{IMM1996-0474,
    author       = "P. C. Hansen",
    title        = "Proceedings of the Interdisciplinary Inversion Workshop 4",
    year         = "1996",
    volume       = "",
    number       = "",
    series       = "",
    publisher    = "IMM",
    address      = "",
    edition      = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/474-full.html"
}