@misc{indiciae18772d8e892b,
  title = {Implementation of three-dimensional image reconstruction for multi-ring positron tomographs.},
  author = {M Defrise and D Townsend and A Geissbuhler},
  year = {1990},
  doi = {10.1088/0031-9155/35/10/002},
  url = {https://pubmed.ncbi.nlm.nih.gov/2243841/},
  note = {Source identifier: 2243841}
}