Archive
Scientific foreign trips
Scientific trip to Switzerland (1987)
Correspondence
Letter, N. Wirth ->A.P. Ershov, 22.01.1986
Letter (draft), A.P. Ershov->N. Wirth, 20.03.1986
Letter, N. Wirth ->A.P. Ershov, 15.05.1986
Justification
Telegram, A.P. Ershov->N. Wirth, 12.01.1987
Letter with attachment, N. Wirth ->A.P. Ershov, 19.01.1987

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