@misc{indiciaebe226cecb815,
  title = {Effective Equality and Effective Implication in Formal Logic.},
  author = {E V Huntington},
  year = {1935},
  doi = {10.1073/pnas.21.5.266},
  url = {https://pubmed.ncbi.nlm.nih.gov/16577669/},
  note = {Source identifier: 16577669}
}