@article{etna_vol34_pp125-135,
  author  = {Andy Wathen and Tyrone Rees},
  title   = {Chebyshev semi-iteration in preconditioning for problems including the mass matrix},
  journal = {Electron. Trans. Numer. Anal.},
  volume  = {34},
  year    = {2008-2009},
  pages   = {125--135},
}