@misc{indiciaed93a80fa5ae1,
  title = {Phase-difference operator.},
  author = {A Luis and LL Sánchez-Soto},
  year = {1993},
  doi = {10.1103/physreva.48.4702},
  url = {https://pubmed.ncbi.nlm.nih.gov/9910179/},
  note = {Source identifier: 9910179}
}