@Article{Mayer:2008:NEP,
  author =       "Jan Mayer",
  title =        "A Numerical Evaluation of Preprocessing and {ILU}-type Preconditioners for the Solution of Unsymmetric Sparse Linear 
                 Systems Using Iterative Methods",
  journal =      "{ACM} Transactions on Mathematical Software",
  volume =       "36",
  number =       "1",
  month  =       mar,
  year   =       2009,
  pages  =       "1:1--1:26",
  URL =          "http://doi.acm.org/10.1145/1486525.1486526",
  accepted =     "2 July 2008",
  abstract =     "
                 Recent advances in multilevel LU
                 factorizations and novel preprocessing
                 techniques have led to an extremely
                 large number of possibilities for
                 preconditioning sparse, unsymmetric
                 linear systems for solving with iterative
                 methods.  However, not all combinations
                 work well for all systems, so making the
                 right choices is essential for obtaining
                 an efficient solver. The numerical results
                 for 256 matrices presented in this article
                 give an indication of which approaches
                 are suitable for which matrices (based
                 on different criteria, such as total
                 computation time or fill-in) and of the
                 differences between the methods.",
}