@ARTICLE\{IMM2001-0398,
    author       = "S. Christiansen",
    title        = "Detecting non-uniqueness of solutions to biharmonic integral
equations through {SVD}.",
    year         = "2001",
    pages        = "23-35.",
    journal      = "Journal of Computational and Applied Mathematics",
    volume       = "134",
    editor       = "",
    number       = "",
    publisher    = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/398-full.html"
}