@MISC\{IMM2000-0863,
    author       = "S. S. Nielsen",
    title        = "A note on Cholesky and {LDL}\^t Factorization",
    year         = "2000",
    month        = "sep",
    publisher    = "",
    address      = "",
    url          = "http://www.imm.dtu.dk/~sn/ps_files/cholnote.pdf"
}