@misc{indiciaef19c522a193f,
  title = {QRS PATTERN IN MITRAL STENOSIS.},
  author = {W S GRAF and L GUNTHER and B ALLENSTEIN},
  year = {1964},
  doi = {10.1016/0002-9149(64)90143-2},
  url = {https://pubmed.ncbi.nlm.nih.gov/14204775/},
  note = {Source identifier: 14204775}
}