@misc{indiciaecf92304b20fd,
  title = {Army heart pump for postsystolic augmentation.},
  author = {R L Hewitt and T Matsumoto},
  year = {1969},
  doi = {10.1001/archsurg.1969.01340130090017},
  url = {https://pubmed.ncbi.nlm.nih.gov/4977819/},
  note = {Source identifier: 4977819}
}