@misc{indiciae820f502f0412,
  title = {An on-line digital integrator for physiological data.},
  author = {J A Freeman and R E Smith},
  year = {1968},
  doi = {10.1152/jappl.1968.24.4.593},
  url = {https://pubmed.ncbi.nlm.nih.gov/5643412/},
  note = {Source identifier: 5643412}
}