The Bibliographic Database of German Publication on Russia, the Soviet Union and its Successor States (RussGus)

The Bibliographic Database of German Publication on Russia, the Soviet Union and its Successor States (RussGus) contains about 170.000 records from 1974 to 2003 and collects publications of different document types: books, dissertations and other university publications, articles from journals and newspapers including reviews, maps etc. The lists of personal and geographical subjects are located here and here.

Your search for Kowalew, Sergej provides 1 hits
1	In Sachen "GULAG II". Brief an den Vorsitzenden des Staatssicherheitskomitees beim Ministerrat der UdSSR, J. W. Andropow, sowie Wortlaut eines offenen Briefes an Andrej Sacharow Kowalew, Sergej, in: Vorwärts, 19.12.1974, 51, S.14

The Bibliographic Database of German Publication on Russia, the Soviet Union and its Successor States (RussGus)

In Sachen "GULAG II". Brief an den Vorsitzenden des Staatssicherheitskomitees beim Ministerrat der UdSSR, J. W. Andropow, sowie Wortlaut eines offenen Briefes an Andrej Sacharow