PACS:01.60.+q, 11.15.−q, 04.60.−m (all) DOI:10.1070/PU1984v027n03ABEH004040 URL: https://ufn.ru/en/articles/1984/3/f/ Citation: Ginzburg V L, Zeldovich Ya B, Keldysh L V, Kirzhnits D A, Markov M A, Ritus V I, Fainberg V Ya, Feinberg E L "Efim Samoilovich Fradkin (on his sixtieth birthday)" Sov. Phys. Usp.27 233–234 (1984)