Telegram, A.P. Ershov->L. N. Korolev, 27.08.1980
Report, 05.09.1980
Letter, W. A. Wulf->A.P. Ershov, 13.09.1979The author discusses possible visit to the USSR.
Letter, A.P. Ershov->W. A. Wulf, 26.10.1979Glad to invite the addressee and his wife to Akademgorodok, suggests the schedule of a one-week stay in the USSR
Letter, W. A. Wulf->A.P. Ershov, 27.12.1979concerns the organization of the scientific trip to the USSR.
Letter, I.V. Pottosin->W. A. Wulf, 04.02.1980
Letter (hand-written), A.P. Ershov->W. A. Wulf, 26.06.1980discussing the itinerary of the addressee's planned trip to the USSR; hoping the invitation letter from the director has already arrived
Letter, W. A. Wulf->A.P. Ershov, 11.07.1980
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