| Telegram, A.P. Ershov->N. S. Furs, 06.12.1978 on publishing the Announcement about the IFIP 80 Congress.
Letter, E. Wada->A.P. Ershov, 18.07.1979In this friendly letter the author tells last news and hopes to meet A.P.Ershov at the IFIP 80 Congress in Tokyo.
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