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Note, 06.09.1980
Letter, D. Yu. Grigoriev->A.P. Ershov, 10.09.1980
Letter, A.P. Ershov->Yu. I. Manin, 30.09.1980
Letter (hand-written), Yu. I. Manin->A.P. Ershov, 30.09.1980
Covering letter (hand-written), Yu. I. Manin->A.P. Ershov, 11.10.1980
Review, 11.10.1980
Covering letter, D. Yu. Grigoriev->A.P. Ershov, 10.11.1980
Article, 10.11.1980
Letter, A.P. Ershov->M. Nivat, 22.01.1981
Letter, A.P. Ershov->I. Grice, 05.02.1981
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