@misc{indiciae40100af875df,
  title = {Single- and double-contrast techniques in esophagitis.},
  author = {R E Koehler and P J Weyman and H F Oakley},
  year = {1980},
  doi = {10.2214/ajr.135.1.15},
  url = {https://pubmed.ncbi.nlm.nih.gov/6771981/},
  note = {Source identifier: 6771981}
}