@misc{indiciaef75812632699,
  title = {First heart sound splitting.},
  author = {P Cossio and P R Cossio and E Kreutzer and P M Cossio and C G Matienzo},
  year = {1966},
  doi = {10.1159/000168513},
  url = {https://pubmed.ncbi.nlm.nih.gov/5937849/},
  note = {Source identifier: 5937849}
}