Cover, 25.05.1981-15.11.1981
Article, 13.10.1981"Projections of languages recognizable by probabilistic and alternating finite multitape automata".
Letter (hand-written), R. V. Freivalds->A.P. Ershov, 13.10.1981
Post card, 29.10.1981
Registration card, 25.05.1981
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