@misc{indiciaec883218ddffc,
  title = {Sinus node function and protamine sulfate.},
  author = {J Alvarez and L Alvarez and C Escudero and J L Castillo Olivares},
  year = {1989},
  doi = {10.1016/0888-6296(89)90010-0},
  url = {https://pubmed.ncbi.nlm.nih.gov/2520639/},
  note = {Source identifier: 2520639}
}