@misc{indiciae2988776a1f86,
  title = {Making the invisible visible.},
  author = {K Hein},
  year = {1994},
  doi = {10.1016/1054-139x(94)90534-7},
  url = {https://pubmed.ncbi.nlm.nih.gov/8018680/},
  note = {Source identifier: 8018680}
}