@misc{indiciaecaf3fc21c530,
  title = {Summation.},
  author = {P Q Peterson},
  year = {1967},
  doi = {10.1111/j.1749-6632.1967.tb14370.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/5230957/},
  note = {Source identifier: 5230957}
}