@misc{indiciae190ba021d420,
  title = {Specification of variability in positioning.},
  author = {D Jones},
  year = {1993},
  doi = {10.1016/0360-3016(93)90087-c},
  url = {https://pubmed.ncbi.nlm.nih.gov/8436541/},
  note = {Source identifier: 8436541}
}