@misc{indiciaeb77cefb13e68,
  title = {An iterative method for the Helmholtz equation},
  author = {Bayliss, A. and Goldstein, C. I. and Turkel, E.},
  year = {1983},
  url = {https://ntrs.nasa.gov/citations/19830047879},
  note = {Source identifier: 19830047879}
}