Persons RUS  ENG    JOURNALS   PEOPLE   ORGANISATIONS   CONFERENCES   SEMINARS   VIDEO LIBRARY   PACKAGE AMSBIB     Freidkin, S A https://www.mathnet.ru/eng/person41070 List of publications on Google Scholar https://mathscinet.ams.org/mathscinet/MRAuthorID/445437 Publications in Math-Net.Ru Citations 1967 1. S. A. Freidkin, “The spectrum of a singular operator”, Mat. Zametki, 2:4 (1967),  379–384      ; Math. Notes, 2:4 (1967), 719–722