@misc{indiciaee06b068f8b7f,
  title = {Letter: Type II block in the A-V node.},
  author = {J A Kastor},
  year = {1974},
  doi = {10.1161/01.cir.50.4.860},
  url = {https://pubmed.ncbi.nlm.nih.gov/4420119/},
  note = {Source identifier: 4420119}
}