Invitation to Kiev for scientific consulting; request for some works by A.P. Ershov and papers on the problems of approximation errors

Thanks for the received works by A.P. Ershov, microfilm and bibliography on the problems of approximation errors. Hopes for near meeting.

A form for A.P. Ershov to fill in connection with the preparation of the collection "Mathematics in the USSR in the last 40 years"