@misc{indiciaeb83563f6c03d,
  title = {Geometrical ray-tracing: a 'ray free' method.},
  author = {A Ho},
  year = {1990},
  doi = {10.1111/j.1475-1313.1990.tb00887.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/2263374/},
  note = {Source identifier: 2263374}
}