@misc{indiciae164a9235aec6,
  title = {One-sided difference schemes and transonic flow.},
  author = {B Engquist and S Osher},
  year = {1980},
  doi = {10.1073/pnas.77.6.3071},
  url = {https://pubmed.ncbi.nlm.nih.gov/16592824/},
  note = {Source identifier: 16592824}
}