@misc{indiciae9eb8f4e32710,
  title = {A NONLOCAL FUNCTION ALGEBRA.},
  author = {E Kallin},
  year = {1963},
  doi = {10.1073/pnas.49.6.821},
  url = {https://pubmed.ncbi.nlm.nih.gov/16591104/},
  note = {Source identifier: 16591104}
}