@misc{indiciae3e743d68f80e,
  title = {The "invisible" can top.},
  author = {R K Levick and L Spitz},
  year = {1977},
  doi = {10.1259/0007-1285-50-596-594},
  url = {https://pubmed.ncbi.nlm.nih.gov/890237/},
  note = {Source identifier: 890237}
}