Retrieved 18 October 2021. "Исаев Михаил Александрович" (in Russian). Federation Council. Retrieved 18 October 2021. "Алексеев Олег Александрович" (in Russian)
Archived from the original on 18 April 2023. Retrieved 18 April 2023. "Алексеев Пётр Фёдорович (1913 – 1999)" [Alekseyev, Pyotr Fedorovich (1913 – 1999)]