Memo, 15.05.1979
Visit Programme, 15.05.1979
Letter, V. P. Areschenko->D. A. Alton, 01.10.1978(?)
Description, 01.10.1978
Resume, 01.10.1978
Letter with attachment, D. A. Alton->A.P. Ershov, 12.04.1977Covering letter and author's CV and reprints of his papers, sent in preparation of the author's visit to Novosibirsk
Letter, enclosure, D. A. Alton->A.P. Ershov, 08.11.1978
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