@misc{indiciae74f8e715d328,
  title = {Vectorial characteristics of ventricular extrasystoles stimulated during cardiac catheterization.},
  author = {M D Klein and C L Feldman and D L Clark and A P Flessas and T J Ryan and R A Peura},
  year = {1976},
  doi = {10.1016/s0022-0736(76)80061-1},
  url = {https://pubmed.ncbi.nlm.nih.gov/57201/},
  note = {Source identifier: 57201}
}