1. Holoeye Photonics AG. http://holoeye.com/ (30March2017).
2. Hamamatsu Photonics. http://www.hamamatsu.com/ (30March2017).
3. Imagine Optic. http://www.imagine-optic.com/ (30March2017).
4. Varioptic. http://varioptic.com/ (30March2017).
5. Tag Optics Inc. http://tag-optics.com/ (30March2017).