Persons RUS  ENG    JOURNALS   PEOPLE   ORGANISATIONS   CONFERENCES   SEMINARS   VIDEO LIBRARY   PACKAGE AMSBIB     Kovalev, Alexandr Ivanovich Candidate of physico-mathematical sciences (1970) https://www.mathnet.ru/eng/person173569 List of publications on Google Scholar https://elibrary.ru/author_items.asp?authorid=136735 Publications in Math-Net.Ru Citations 1989 1. N. A. Bazhanov, D. S. Bulyanitsa, A. I. Kovalev, V. V. Polyakov, V. Yu. Trautman, E. D. Trifonov, A. V. Shvedchikov, “Superradiance at the NMR frequency in a proton spin system in a solid”, Fizika Tverdogo Tela, 31:2 (1989),  206–208   Organisations B. P. Konstantinov Petersburg Nuclear Physics Institute, Russian Academy of Sciences B. P. Konstantinov Leningrad Nuclear Physics Institute of the USSR Academy of Sciences