@misc{indiciaeb09e3c1fd7b9,
  title = {Approximate Methods in Mathematics.},
  author = {M Herzberger},
  year = {1953},
  doi = {10.1073/pnas.39.8.853},
  url = {https://pubmed.ncbi.nlm.nih.gov/16589342/},
  note = {Source identifier: 16589342}
}