Visit Programme, 02.02.1966
Covering letter with attachment, G. I. Marchuk->M. A. Lavrentiev, 27.12.1967Request to consider Ershov's foreign trip file for his visit to Switzerland in March 1968 for participation in the IFIP PC meeting. Enclosed are the trip's justification, directives, and the reference of Ershov's scientific and administrative activities for 1965-1967
Letter, G. I. Marchuk->A. A. Dorodnitsyn, 25.01.1968
Justification and Directions, G. I. Marchuk->A.P. Ershov, 17.04.1968
Letter, G. I. Marchuk->V. V. Pazelskiy, 17.04.1968
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