@misc{indiciaecb6f6aca2060,
  title = {Ruler for measuring physiological tracings with a variable standard.},
  author = {D Pickering},
  year = {1975},
  doi = {10.1016/s0140-6736(75)91366-5},
  url = {https://pubmed.ncbi.nlm.nih.gov/47427/},
  note = {Source identifier: 47427}
}