@misc{indiciaeab45bf7859b5,
  title = {Comment on "Phase-difference operator"},
  author = {DT Pegg and JA Vaccaro},
  year = {1995},
  doi = {10.1103/physreva.51.859},
  url = {https://pubmed.ncbi.nlm.nih.gov/9911651/},
  note = {Source identifier: 9911651}
}