@misc{indiciae63c9e97c36d8,
  title = {A free space-time traversal data-logging system for two human subjects.},
  author = {M J MacCulloch and C J Birtles and S Bond},
  year = {1969},
  doi = {10.1007/bf02551729},
  url = {https://pubmed.ncbi.nlm.nih.gov/5402069/},
  note = {Source identifier: 5402069}
}