@misc{indiciae38c624a81dbe,
  title = {Comment on "Diffraction-free beams"},
  author = {D DeBeer and SR Hartmann and R Friedberg},
  year = {1987},
  doi = {10.1103/physrevlett.59.2611},
  url = {https://pubmed.ncbi.nlm.nih.gov/10035597/},
  note = {Source identifier: 10035597}
}