@misc{indiciae61dac540a011,
  title = {Quantum phase measurement: A system-theory perspective.},
  author = {JH Shapiro and SR Shepard},
  year = {1991},
  doi = {10.1103/physreva.43.3795},
  url = {https://pubmed.ncbi.nlm.nih.gov/9905468/},
  note = {Source identifier: 9905468}
}