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50th birthday anniversary
Letter
Letter
with congratulations from S.A.Rukova. (With a hand-written Ershov's explanatory remark addressed to his mother.)
Date: 21.04.1981
Original document language: Russian
Authors: Sofiya A. Rukova
Organizations: "Matematicheskaya Entsiklopediya" Editorial Board
Addressee: Andrei Petrovich Ershov

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