Cover, 30.08.1979-12.11.1979
Letter, J. L. Szwarcfiter->A.P. Ershov, 24.07.1979
Referee's report, 10.10.1979
Artcle, 30.07.1979"System of Distinct Representatives for k Families of Sets".
Telegram, A.P. Ershov->J. L. Szwarcfiter, 31.08.1979
Letter, J. L. Szwarcfiter->A.P. Ershov, 05.09.1979
Post card, 22.10.1979
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