1. History of laser 1960–2019 Melinda Rose and Hank Hogan. June 2019. Photonics Media. https://www.photonics.com/Articles/A_History_of_the_Laser_1960_-_2019/a42279
2. Einstein A. Zur quantentheorie der strahlung. 1916. http://www.ing-buero-ebel.de/strahlung/Original/Einstein.pdf.
3. Wright VC. Laser surgery: using the carbon dioxide laser. Can Med Assoc J. 1982;126(9):1035–9.
4. Stoppler MC. Medical definition of laser surgery. https://www.rxlist.com/laser/definition.htm.
5. Maiman T. Stimulated optical radiation in Ruby. Nature. 1960;187:493–4.