@misc{indiciaef88a241d40bf,
  title = {Penrose sleeve.},
  author = {J G Stoner and N A Swanson and N Vargo},
  year = {1983},
  doi = {10.1111/j.1524-4725.1983.tb00847.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/6853819/},
  note = {Source identifier: 6853819}
}