@misc{indiciae5b6fd31f8e98,
  title = {General Invariants of Irregular Analytic Elements.},
  author = {E Kasner and J De Cicco},
  year = {1941},
  doi = {10.1073/pnas.27.1.88},
  url = {https://pubmed.ncbi.nlm.nih.gov/16588435/},
  note = {Source identifier: 16588435}
}