@article{etna_vol31_pp86-109,
  author  = {James V. Lambers},
  title   = {Enhancement of Krylov subspace spectral methods by block Lanczos iteration},
  journal = {Electron. Trans. Numer. Anal.},
  volume  = {31},
  year    = {2008},
  pages   = {86--109},
}