| Letter, V. A. Uspensky->A.P. Ershov, 03.11.1980 Urgent request to prepare an article for "Semiotic and informatics" journal
Typing instructions, A.P. Ershov->L.I. Kotovato typists
Article, 03.02.1981"Computability in arbitrary domains and bases" (handwritten copy)
Article, 04.02.1981"Computability in arbitrary domains and bases" (typewriten copy)
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