Letter (hand-written), V. K. Sabelfeld->A.P. Ershov, 02.11.1979
Article, 02.11.1979"The logic-termal equivalence is polynomial-time decidable".
Post card, J. Muir->A.P. Ershov, 27.11.1979
Cover, 02.11.1979-18.03.1980
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