Letter, S. L. Sobolev->A.P. Ershov, 08.01.1980 Invitation to join the Conference Organizing Committee
Conference Announcement, Organizing Committee->A.P. Ershov, 13.03.1980and call for papers
Invitation, 18.05.1980to the conference
Notes, 18.06.1980-19.06.1980taken by A.P. Ershov at the conference
Abstract
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