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Documents associated with "Matematicheskaya Entsiklopediya" Editorial Board Letter, V. Bityutskov->A.P. Ershov, 11.01.1974 Request to writh the articles "Theoretical programming" and "Theory of program schemata" for the 3rd volume of Mathematical Encyclopedia
Letter, V. Bityutskov->A.P. Ershov, 05.02.1974Request to be in charge of the "Theoreticle programming" series of items
Letter, S. A. Rukova->A.P. Ershov, 21.04.1981with congratulations from S.A.Rukova. (With a hand-written Ershov's explanatory remark addressed to his mother.)
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