@misc{indiciae1d208db01872,
  title = {The second heart sound.},
  author = {N P DePasquale and G E Burch and J H Phillips},
  year = {1968},
  doi = {10.1016/0002-8703(68)90238-x},
  url = {https://pubmed.ncbi.nlm.nih.gov/4952736/},
  note = {Source identifier: 4952736}
}