@misc{indiciaeee8be5194dae,
  title = {Angular Schmidt modes in spontaneous parametric down-conversion},
  author = {Straupe, S S and Ivanov, D P and Kalinkin, A A and Bobrov, I B and Kulik, S P},
  year = {2011},
  doi = {10.1103/physreva.83.060302},
  url = {https://www.osti.gov/biblio/21550011},
  note = {Source identifier: 21550011}
}