@misc{indiciae084bb355acac,
  title = {An inequality for the hilbert transform.},
  author = {R Redheffer},
  year = {1968},
  doi = {10.1073/pnas.61.3.810},
  url = {https://pubmed.ncbi.nlm.nih.gov/16591712/},
  note = {Source identifier: 16591712}
}