@misc{indiciaea1cbab3b3c02,
  title = {Preface.},
  author = {H C Stam},
  year = {1969},
  doi = {10.1017/s0424208400004666},
  url = {https://pubmed.ncbi.nlm.nih.gov/5765691/},
  note = {Source identifier: 5765691}
}