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Cernova Burger, Irina (29 November 2018). Peter Sager and the «Russian» collections in the The Swiss Library of Eastern Europe:«Rossica Europeana» and «Russian books from Davos» (Unpublished). In: The history of the book culture of the XV-XX centuries. In commemoration of the 100th anniversary of the Research Department of Rare Books (Book Museum) of the RSL. Moskau. 28.-29.11.2018.
