| Newsletter, 07.08.1977 of the Congress (7th of August 1977).
Letter, A.P. Ershov->J. McCarthy, 25.10.1976Account of the trips taken in September and October of 1976; request for help in organization of the IFIP-77 Panel discussion; account of the family news
Letter, A.P. Ershov->J. P. Thorne, 18.11.1976
Letter, J. P. Thorne->A.P. Ershov, 05.08.1977
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