Dmitriev, M. V., I. N. Yerimichoy, and L. I. Panov. “Method of Determining of Crystal Part in Glass-Ceramic Dielectric”. Technology and Design in Electronic Equipment, no. 5, Oct. 2009, pp. 50-53, https://www.tkea.com.ua/index.php/journal/article/view/TKEA2009.5.50.