@article{carpentieri2003class,
  title={A class of spectral two-level preconditioners},
  author={Carpentieri, Bruno and Duff, Iain S and Giraud, Luc},
  journal={SIAM Journal on Scientific Computing},
  volume={25},
  number={2},
  pages={749--765},
  year={2003},
  publisher={SIAM}
}

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