@misc{indiciae90c371e21d1d,
  title = {A Convexity Theorem.},
  author = {R Salem and A Zygmund},
  year = {1948},
  doi = {10.1073/pnas.34.9.443},
  url = {https://pubmed.ncbi.nlm.nih.gov/16578303/},
  note = {Source identifier: 16578303}
}