@ARTICLE\{IMM1988-03212,
    author       = "Z. Zlatev and H. B. Nielsen",
    title        = "Solving Large and Sparse Linear Least-Squares Problems by Conjugate Gradient Algorithms",
    year         = "1988",
    pages        = "185-202",
    journal      = "Comput. Math. Applic.",
    volume       = "15",
    editor       = "",
    number       = "2",
    publisher    = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/3212-full.html"
}