@misc{indiciae35e9c55b2852,
  title = {Ultimate quantum limits on phase measurement.},
  author = {JH Shapiro and SR Shepard and NC Wong},
  year = {1989},
  doi = {10.1103/physrevlett.62.2377},
  url = {https://pubmed.ncbi.nlm.nih.gov/10039970/},
  note = {Source identifier: 10039970}
}