@conference{90571,
  author = {Ulf Griesmann and Quandou Wang and Johannes Soons and Remi Carakos},
  title = {A Simple Ball Averager for Reference Sphere Calibrations},
  year = {2005},
  number = {5869},
  month = {2005-01-01},
  publisher = {SPIE Optics and Photonics 2005 Conference, San Diego, CA},
  url = {https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=822303},
  language = {en},
}