@misc{indiciaea33e038cfc2f,
  title = {Combined trabeculectomy and cataract extraction.},
  author = {G E Johns and W E Layden},
  year = {1979},
  doi = {10.1016/0002-9394(79)90401-x},
  url = {https://pubmed.ncbi.nlm.nih.gov/517620/},
  note = {Source identifier: 517620}
}