Invitation to take part in the Summer School "Programming-79" as a lecturer

of the "Programming-79" Summer School

for the authors submitting papers

about invitation to Ershov and Pottosin; request to send the documents for exit permits

Request to set the date of depurture for Sofia to June 8.

informing that Ershov's traveller's dossier has been sent to Moscow

Discussion of the preparation of the trip

of A.P. Ershov's scientific trip to Bulgaria

Request to draw up Ershov's documents for the planned trip to Bulgaria

of necessity of A.P. Ershov's trip to Bulgaria

for Ershov's treveller's dossier