Kovtun, G. P., A. I. Kravchenko, and A. I. Kondrik. “Temperature Field in Yttrium Aluminum Garnet Crystal During Two-Stage Growth”. Technology and Design in Electronic Equipment, no. 3, June 2005, pp. 5-7, https://www.tkea.com.ua/index.php/journal/article/view/TKEA2005.3.05.