Letter, A.A. Klas->A.P. Ershov, 12.01.1976
Letter (hand-writen draft), A.P. Ershov->A.A. Klas, 09.02.1976
Letter, A.A. Klas->A.P. Ershov, 08.03.1976
Letter, A.A. Klas->A.P. Ershov, 10.01.1977
Letter(hand-written draft), A.P. Ershov->A.A. Klas, 31.03.1977
Justification of Necessity, 01.05.1977(?)of September'77 buisness trip to Czechoslovakia.
Justification of Necessity, H. Kanoui->A.P. Ershov..., 01.05.1977(?)of September'77 buisness trip to Czechoslovakia.
Scientific Assignment, 16.05.1977
Telegram (draft), 05.03.1977(?)Title of Paper, "Correctness of Mixed Computation in Algol-like Programs"
Written rulesfor going to Czechoslovakia Soviet Scientists
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