@misc{indiciaea6fa56eb03cd,
  title = {[Indications for closed mitral valvotomy using microcatheterization].},
  author = {M Niederberger and K Steinbach and F Unger},
  year = {1973},
  url = {https://pubmed.ncbi.nlm.nih.gov/4700178/},
  note = {Source identifier: 4700178}
}