@article{carpentieri2007additive,
  title={Additive and multiplicative two-level spectral preconditioning for general linear systems},
  author={Carpentieri, Bruno and Giraud, Luc and Gratton, Serge},
  journal={SIAM Journal on Scientific Computing},
  volume={29},
  number={4},
  pages={1593--1612},
  year={2007},
  publisher={SIAM}
}

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