@misc{indiciae940b4474604e,
  title = {A compact back projection system.},
  author = {G A Morrant and F J Harty and W J Morgan},
  year = {1977},
  doi = {10.1038/sj.bdj.4803946},
  url = {https://pubmed.ncbi.nlm.nih.gov/71158/},
  note = {Source identifier: 71158}
}