@misc{indiciae7f82fc8baaeb,
  title = {Progress in gastrointestinal endoscopy--introduction.},
  author = {B C Manegold},
  doi = {10.1007/bf01658389},
  url = {https://pubmed.ncbi.nlm.nih.gov/2728466/},
  note = {Source identifier: 2728466}
}