@misc{indiciae871bc7695fd4,
  title = {Linear Operations among Summable Functions.},
  author = {N Dunford and B J Pettis},
  year = {1939},
  doi = {10.1073/pnas.25.10.544},
  url = {https://pubmed.ncbi.nlm.nih.gov/16588302/},
  note = {Source identifier: 16588302}
}