@misc{indiciae67dedb053111,
  title = {Sinus node recovery time in the elderly.},
  author = {H E Kulbertus and F Leval-Rutten and L Mary and P Casters},
  year = {1975},
  doi = {10.1136/hrt.37.4.420},
  url = {https://pubmed.ncbi.nlm.nih.gov/1125118/},
  note = {Source identifier: 1125118}
}