@misc{indiciaec35775569a71,
  title = {M-mode echocardiography. Basic principles.},
  author = {J D Bonagura},
  year = {1983},
  doi = {10.1016/s0195-5616(83)50031-4},
  url = {https://pubmed.ncbi.nlm.nih.gov/6604983/},
  note = {Source identifier: 6604983}
}