@INCOLLECTION\{IMM2006-04347,
    author       = "P. C. Hansen and H. B. Nielsen",
    title        = "Least Squares Solution of Linear Systems",
    year         = "2006",
    booktitle    = "Handbook of Linear Algebra",
    volume       = "",
    number       = "",
    series       = "",
    publisher    = "CRC",
    address      = "",
    edition      = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/4347-full.html"
}