@misc{indiciaecda1237a177f,
  title = {Content-Preserving Transformations.},
  author = {M S Knebelman},
  year = {1930},
  doi = {10.1073/pnas.16.2.156},
  url = {https://pubmed.ncbi.nlm.nih.gov/16587540/},
  note = {Source identifier: 16587540}
}