@misc{indiciae0b14a802b35f,
  title = {On finite element methods for the Helmholtz equation},
  author = {Aziz, A. K. and Werschulz, A. G.},
  year = {1979},
  url = {https://ntrs.nasa.gov/citations/19800042513},
  note = {Source identifier: 19800042513}
}