@misc{indiciaef44d295bf5af,
  title = {KKT Preconditioners for PDE-Constrained Optimization with the Helmholtz Equation},
  author = {Kouri, Drew P. and Ridzal, Denis and Tuminaro, Ray},
  year = {2021},
  doi = {10.1137/20m1349199},
  url = {https://www.osti.gov/biblio/1784959},
  note = {Source identifier: 1784959}
}