@misc{indiciae4aa930600e6e,
  title = {Echocardiography: M-mode and two-dimensional methods.},
  author = {R L Popp and D S Rubenson and C R Tucker and J W French},
  year = {1980},
  doi = {10.7326/0003-4819-93-6-844},
  url = {https://pubmed.ncbi.nlm.nih.gov/7447194/},
  note = {Source identifier: 7447194}
}