@misc{indiciae2256fe02931b,
  title = {PREDICATES, TERMS, OPERATIONS, AND EQUALITY IN POLYADIC BOOLEAN ALGEBRAS.},
  author = {P R Halmos},
  year = {1956},
  doi = {10.1073/pnas.42.3.130},
  url = {https://pubmed.ncbi.nlm.nih.gov/16589835/},
  note = {Source identifier: 16589835}
}