@misc{indiciaeb4e6dac9aa7b,
  title = {Complete Differential Systems.},
  author = {J M Thomas},
  year = {1936},
  doi = {10.1073/pnas.22.2.109},
  url = {https://pubmed.ncbi.nlm.nih.gov/16588051/},
  note = {Source identifier: 16588051}
}