@misc{indiciae89a373b8ca5e,
  title = {An Integral Equality and its Applications.},
  author = {E Hille},
  year = {1921},
  doi = {10.1073/pnas.7.10.303},
  url = {https://pubmed.ncbi.nlm.nih.gov/16576612/},
  note = {Source identifier: 16576612}
}