PACS:01.60.+q DOI:10.3367/UFNe.2021.12.039126 URL: https://ufn.ru/en/articles/2022/12/j/ 001112544300009 Citation: Aganbegyan A G, Vainshtein A I, Dudnikova G I, Zakharov V E, Zelenyi L M, Kuznetsov E A, Litvak A G, Nigmatulin R I, Ryutov D D, Skrinsky A N, Sunyaev R A, Fedoruk M P "Roald Zinnurovich Sagdeev (on his 90th birthday)" Phys. Usp.65 1317–1319 (2022)