@misc{indiciae6aae37395f9e,
  title = {Expandable rings. A new solution to an old problem.},
  author = {G E Giddins},
  year = {1997},
  doi = {10.1016/s0266-7681(97)80349-x},
  url = {https://pubmed.ncbi.nlm.nih.gov/9752907/},
  note = {Source identifier: 9752907}
}