@article{etna_vol60_pp197-220,
  author  = {Jemima M. Tabeart and John W. Pearson},
  title   = {Saddle point preconditioners for weak-constraint 4D-Var},
  journal = {Electron. Trans. Numer. Anal.},
  volume  = {60},
  year    = {2024},
  pages   = {197--220},
  doi     = {10.1553/etna_vol60s197},
}