@misc{indiciae2ba43e2f4b79,
  title = {GENERALIZED DERIVATIVES AND EXPANSIONS.},
  author = {K Menger and S S Shü},
  year = {1955},
  doi = {10.1073/pnas.41.8.591},
  url = {https://pubmed.ncbi.nlm.nih.gov/16578450/},
  note = {Source identifier: 16578450}
}