@article{etna_vol28_pp16-39,
  author  = {Michele Benzi and Nader Razouk},
  title   = {Decay bounds and $O$($n$) algorithms for approximating functions of sparse matrices},
  journal = {Electron. Trans. Numer. Anal.},
  volume  = {28},
  year    = {2007-2008},
  pages   = {16--39},
}