Multigrid in energy preconditioner for Krylov solvers

@article{Slaybaugh2013MultigridIE,
  title={Multigrid in energy preconditioner for Krylov solvers},
  author={Rachel N. Slaybaugh and Thomas M. Evans and Gregory G. Davidson and Paul P. H. Wilson},
  journal={J. Comput. Phys.},
  year={2013},
  volume={242},
  pages={405-419}
}
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