@misc{indiciae021d430ddcdc,
  title = {Letter: Three-dimensional shapes.},
  author = {J R Morris and J D Harris},
  year = {1976},
  doi = {10.1016/s0140-6736(76)91587-7},
  url = {https://pubmed.ncbi.nlm.nih.gov/58240/},
  note = {Source identifier: 58240}
}