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Emmett, John L.; Scarratt, Kenneth; McClure, Shane F.; Moses, Thomas; Douthit, Troy R.; Hughes, Richard; Novak, Steve; Shigley, James E.; Wang, Wuyi; Bordelon, Owen; Kane, Robert E. (Spring 2003). "Beryllium diffusion of ruby and sapphire"(PDF). Gems & Gemology. 39 (2): 84–135. doi:10.5741/GEMS.39.2.84. Archived(PDF) from the original on 1 August 2020. Retrieved 4 November 2019.
"Cermax® Products and Specifications"(PDF). Fremont, California, USA: PerkinElmer Optoelectronics. Archived(PDF) from the original on 12 September 2017. Retrieved 12 September 2017.
Dobrovinskaya, Elena R.; Lytvynov, Leonid A.; Pishchik, Valerian (2009). "Properties of Sapphire". Sapphire(PDF). Micro- and Opto-Electronic Materials, Structures, and Systems. pp. 55–176. doi:10.1007/978-0-387-85695-7_2. ISBN978-0-387-85694-0. Archived(PDF) from the original on 15 February 2017. Retrieved 11 September 2017.
Emmett, John L.; Scarratt, Kenneth; McClure, Shane F.; Moses, Thomas; Douthit, Troy R.; Hughes, Richard; Novak, Steve; Shigley, James E.; Wang, Wuyi; Bordelon, Owen; Kane, Robert E. (Spring 2003). "Beryllium diffusion of ruby and sapphire"(PDF). Gems & Gemology. 39 (2): 84–135. doi:10.5741/GEMS.39.2.84. Archived(PDF) from the original on 1 August 2020. Retrieved 4 November 2019.
Dobrovinskaya, Elena R.; Lytvynov, Leonid A.; Pishchik, Valerian (2009). "Properties of Sapphire". Sapphire(PDF). Micro- and Opto-Electronic Materials, Structures, and Systems. pp. 55–176. doi:10.1007/978-0-387-85695-7_2. ISBN978-0-387-85694-0. Archived(PDF) from the original on 15 February 2017. Retrieved 11 September 2017.
"Cermax® Products and Specifications"(PDF). Fremont, California, USA: PerkinElmer Optoelectronics. Archived(PDF) from the original on 12 September 2017. Retrieved 12 September 2017.