Klunnikova, Y V, and S P Malyukov. “Physical and Technological Fundamentals of Sapphire Substrates Production for Devices of Solid-State Electronics”. KnE Engineering 3, no. 5 (May 7, 2018): 179–184. Accessed July 18, 2024. https://knepublishing.com/index.php/KnE-Engineering/article/view/2240.