@misc{indiciae2fe6e66f7b4c,
  title = {Wide-angle one-way wave equations.},
  author = {L Halpern and L N Trefethen},
  year = {1988},
  doi = {10.1121/1.396586},
  url = {https://pubmed.ncbi.nlm.nih.gov/3198873/},
  note = {Source identifier: 3198873}
}