@misc{indiciae1f58c6258848,
  title = {On the Average Value of Arithmetic Functions.},
  author = {R Bellman},
  year = {1948},
  doi = {10.1073/pnas.34.4.149},
  url = {https://pubmed.ncbi.nlm.nih.gov/16588796/},
  note = {Source identifier: 16588796}
}