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1980 | |
Preprint, 04.04.1979
Article, 21.11.1979
Article, 01.02.1980(?)
Letter (hand-written) and cover, V. V. Ivanov->A.P. Ershov, 28.01.1980
Letter, A.P. Ershov->A. M. Mikhalitsov, 21.04.1980
Information, 01.03.1980(?)
Telegram (draft), A.P. Ershov->S. S. Maschan, 30.04.1980
Paper (draft), 06.05.1980
Information letter, 14.05.1980
Decision, 14.05.1980
Direction, 19.05.1980
Letter (hand-written), V. Yu. Rosenzweig->A.P. Ershov, 24.05.1980
Letter (draft), A.P. Ershov->V. Yu. Rosenzweig, 25.05.1980
Lists, 10.06.1980
Letter with attachment, A.P. Ershov->Yu. S. Martemianov, 10.06.1980(?)
Letter (hand-written), V. V. Ivanov->A.P. Ershov, 03.06.1980
Letter, V. Yu. Rosenzweig->A.P. Ershov, 12.06.1980
Letter, A.P. Ershov->V. Yu. Rosenzweig, 23.06.1980
Letter, A.P. Ershov->V. V. Ivanov, 23.06.1980
Letter and Cover, Yu. S. Martemianov->A.P. Ershov, 11.07.1980
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