@Article{Davis:2005:ACS,
  author =       "Timothy A. Davis",
  title =        "Algorithm 849: A Concise Sparse {Cholesky} Factorization Package",
  journal =      "{ACM} Transactions on Mathematical Software",
  volume =       "31",
  number =       "4",
  month =        dec,
  year =         "2005",
  pages =        "587--591",
  URL =          "http://doi.acm.org/10.1145/1114268.1114277", 
  abstract =     "The LDL software package is a set of short, concise routines for factorizing 
                 symmetric positive-definite sparse matrices, with some applicability to 
                 symmetric indefinite matrices. Its primary purpose is to illustrate much of 
                 the basic theory of sparse matrix algorithms in as concise a code as possible, 
                 including an elegant method of sparse symmetric factorization that computes 
                 the factorization row-by-row but stores it column-by-column. The entire 
                 symbolic and numeric factorization consists of less than 50 lines of code. 
                 The package is written in C, and includes a MATLAB interface.",
}