@misc{indiciae8093488b933d,
  title = {The crystal problem for polytypes.},
  author = {D P Varn and G S Canright},
  year = {2001},
  doi = {10.1107/s0108767300010680},
  url = {https://pubmed.ncbi.nlm.nih.gov/11124498/},
  note = {Source identifier: 11124498}
}