Archive
The USSR Academy of Sciences
Correspondence
Letter, 02.11.1972
Plan, 28.08.1984
Confirmation certificate, 31.01.1975
Letter, A. V. Petrova->A.P. Ershov, 19.08.1971
Telegrams, A.P. Ershov->M. A. Lavrentiev..., 18.11.1975
Information, 01.09.1968(?)

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