@misc{indiciaeb0d732a27de5,
  title = {A three-dimensional second-derivative surface-detection algorithm for volume determination on SPECT images.},
  author = {P G Hillel and D L Hastings},
  year = {1993},
  doi = {10.1088/0031-9155/38/5/002},
  url = {https://pubmed.ncbi.nlm.nih.gov/8321888/},
  note = {Source identifier: 8321888}
}