@misc{indiciae1699bdf5f729,
  title = {On physiological radio-activity.},
  author = {H Zwaardemaker},
  year = {1920},
  doi = {10.1113/jphysiol.1920.sp001878},
  url = {https://pubmed.ncbi.nlm.nih.gov/16993416/},
  note = {Source identifier: 16993416}
}