Justification, 13.02.1985 of sending Acad. A.P. Ershov to Bulgaria
Letter, 13.02.1985
Letter, A. S. Alekseev->I. I. Nedlin, 13.02.1985
Reference, 13.02.1985
Scientific Assignment, 13.02.1985to academician A.P. Ershov going to Bulgaria for 7 days for participation in the international conference "Children in Computer World"
Telephone message, 08.02.1985
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