@ARTICLE\{IMM2006-04348,
    author       = "P. C. Hansen and T. K. Jensen",
    title        = "Smoothing-Norm Preconditioning for Regularizing Minimum-Residual Methods",
    year         = "2006",
    pages        = "1-14",
    journal      = "{SIAM} J. Matrix Analysis and Applications",
    volume       = "29",
    editor       = "",
    number       = "1",
    publisher    = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/4348-full.html"
}