@misc{indiciae024f5500e511,
  title = {Differential Equations and Implicit Functions in Infinitely Many Variables.},
  author = {W L Hart},
  year = {1916},
  doi = {10.1073/pnas.2.6.309},
  url = {https://pubmed.ncbi.nlm.nih.gov/16576150/},
  note = {Source identifier: 16576150}
}