@misc{indiciaecaf5257f60e4,
  title = {Higher-order extrema in two-dimensional wave fields.},
  author = {I Freund and A Belenkiy},
  year = {2000},
  doi = {10.1364/josaa.17.000434},
  url = {https://pubmed.ncbi.nlm.nih.gov/10708023/},
  note = {Source identifier: 10708023}
}