@misc{indiciaec3871de4eb6a,
  title = {Cardiac performance during pregnancy: serial evaluation using external systolic time intervals.},
  author = {P R Liebson and L I Mann and M I Evans and S Duchin and L Arditi},
  year = {1975},
  doi = {10.1016/0002-9378(75)90606-7},
  url = {https://pubmed.ncbi.nlm.nih.gov/1130438/},
  note = {Source identifier: 1130438}
}