Gracheva, Anna, и Elena Kopnova. «Statistical Analysis of Assigning a Corporate Credit Rating With Regard to the Sovereign Rating in the Russian Federation». Journal of Corporate Finance Research / Корпоративные Финансы | ISSN: 2073-0438 16, no. 1 (май 28, 2022): 65-82. просмотрено май 6, 2024. https://cfjournal.hse.ru/article/view/11961.