Kozliakov, Viacheslav, and Alla Sevastyanova. “An Unknown Work about Boris Godunov from the Post-Petrine Era”. Quaestio Rossica 9, no. 3 (September 29, 2021): 947–964. Accessed December 5, 2022. https://qr.urfu.ru/ojs/index.php/qr/article/view/qr.620.