Kritskaya , T., L. Shvartsman, and G. Kiselev. “TRANSITION OF CARBON IMPURITY IN CRYSTAL SILICON OF SEMICONDUCTOR PURITY”. Scientific Journal "Metallurgy", no. 2(42), Mar. 2020, pp. 105-10, http://metal.journalsofznu.zp.ua/index.php/journal/article/view/41.