@misc{indiciae503de27cfec7,
  title = {Physiological ROI definition by image subtraction.},
  author = {P T Fox},
  year = {1991},
  doi = {10.1038/jcbfm.1991.41},
  url = {https://pubmed.ncbi.nlm.nih.gov/1997492/},
  note = {Source identifier: 1997492}
}