@misc{indiciae11cf9ed66622,
  title = {On the angular-spectrum representation of multipole wave fields.},
  author = {Riccardo Borghi},
  year = {2004},
  doi = {10.1364/josaa.21.001805},
  url = {https://pubmed.ncbi.nlm.nih.gov/15384448/},
  note = {Source identifier: 15384448}
}