AvrutskayaSvetlana, and Elizaveta Maricheva. “Testing Russian Stock Market Efficiency Using Event Studies: Impact of Credit Ratings Changes”. Journal of Corporate Finance Research | ISSN: 2073-0438 15, no. 2 (June 1, 2021): 42-54. Accessed December 19, 2024. https://cfjournal.hse.ru/article/view/12418.