of A.Ershov's visit to Poland

of A.Ershov's visit to GDR

of A.Ershov's visit to Poland

of A.Ershov's visit to the USA

of provision of cultural facilities to Prof. Khoang Tui

of A.Ershov's visit to the USA

of A.Ershov's visit to the USA (minimal and maximal length of time variants)

of A.P. Ershov's visit to Sweden

to the Zaritski's letter: G.I.Marchuk's resolution on a standard control card and a note instructing to consider the issue.

of the official opponent of dissertation by A.D. Korshunov "On the number of elements of free distributive structure (on the number of monotonous boolean functions)" (typewritten and handwritten copies)

of work collective of the Institute of Mathematics and Computing Center for 1963