@misc{indiciae91103eec6f84,
  title = {Progressively decreasing ectopic to second sinus beat intervals in concealed trigeminy.},
  author = {V K Singh},
  year = {1987},
  doi = {10.1016/s0022-0736(87)80028-6},
  url = {https://pubmed.ncbi.nlm.nih.gov/2443591/},
  note = {Source identifier: 2443591}
}