@misc{indiciaefd5a2aea7883,
  title = {The first heart sound.},
  author = {R Prakash},
  year = {1978},
  doi = {10.1161/01.cir.57.1.202},
  url = {https://pubmed.ncbi.nlm.nih.gov/618394/},
  note = {Source identifier: 618394}
}