PACS:01.60.+q DOI:10.1070/PU1997v040n08ABEH000278 URL: https://ufn.ru/en/articles/1997/8/h/ A1997XX57300007 Citation: Basov N G, Keldysh L V, Krokhin O N, Oraevskii A N, Man’ko V I "In memory of Andrei Vladimirovich Vinogradov" Phys. Usp.40 853–854 (1997)