| Letter, V. Bityutskov->A.P. Ershov, 27.11.1979 reminding of the deadline for the articles
Letter, B. V. Biryukov->A.P. Ershov, 13.12.1979Official order for the article "Program translation"
Letter, V. Bityutskov->A.P. Ershov, 05.06.1980Official order for the article "Programming language"
Letter (hand-written), S. A. Rukova->A.P. Ershov, 01.07.1980The author sends a copy of the article "Programming language" with the request to answer some questions
Letter, A.P. Ershov->S. A. Rukova, 05.08.1980answering the questions from the letter of 1 June 1980
Letter, V. Bityutskov->A.P. Ershov, 30.10.1980reminding of the deadline for the articles
Letter, V. Bityutskov->A.P. Ershov, 03.11.1980reminding of the deadline for the articles
Letter (hand-written), S. A. Rukova->A.P. Ershov, 05.12.1980Request to speed up delivery of the articles for the Encyclopedia
Telegram (hand-written), A.P. Ershov->S. A. Rukova, 11.12.1980notifying of the intensive work over the "P"-headword articles
Letter, A.P. Ershov->V. Bityutskov, 26.01.1981on the progress of articles writing
Letter (hand-written), S. A. Rukova->A.P. Ershov, 26.02.1981with remarks on the received articles, some questions, and request to make corrections
Letter (hand-written), S. A. Rukova->A.P. Ershov, 23.03.1981Request to answer some questions and to send over filled-in author's cards
Covering letter, A.P. Ershov->S. A. Rukova, 30.03.1981to the articles (handwritten and typewritten copies)
Letter (hand-written), S. A. Rukova->A.P. Ershov, 08.04.1981about two more articles in need of corrections
Letter, S. A. Rukova->A.P. Ershov, 04.05.1981Request to clarify some points concerning the articles
Letter (hand-written), A.P. Ershov->S. A. Rukova, 18.05.1981answering the questions about the encyclopedia articles (handwritten and typewritten copies)
Covering letter with attachment, V. Bityutskov->A.P. Ershov..., 04.06.1981Official order for the articles "Statement" and "Operand"
Letter (hand-written), S. A. Rukova->A.P. Ershov, 29.05.1981Thanks for the detailed reply and reminding of the article series for the single-volume "Mathematical Encyclopedic Dictionary"
Covering letter (hand-written), A.P. Ershov->S. A. Rukova, 20.08.1981to the articles "Statement" and "Operand"
Letter, V. Bityutskov->A.P. Ershov, 26.10.1981Request to proof-read the "Computer-oriented language" article
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