@misc{indiciaec0bfecb32d08,
  title = {Letter: E-F slope without "a" wave.},
  author = {J A Levisman},
  year = {1976},
  doi = {10.1161/01.cir.53.4.744},
  url = {https://pubmed.ncbi.nlm.nih.gov/1253401/},
  note = {Source identifier: 1253401}
}