| Program, 10.04.1962 of A.Ershov's visit to the USA
Program, 09.01.1963of A.Ershov's visit to the USA (minimal and maximal length of time variants)
Instructions, S. L. Sobolev->A.P. Ershov, 01.02.1962to A.P. Ershov for participation in the 2nd IFIP Congress
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