| Article, 29.03.1985 "Basic Concepts of Algorithms and Programming to be Taught in a School Course in Informatics"
Covering letter, C.-E. Froeberg->A.P. Ershov, 07.04.1988to the proofs of the paper from BIT editor
Article, 13.05.1988
Telegram, A.P. Ershov->C.-E. Froeberg, 16.05.1988
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