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 Zetterberg, Seppo provides 2 hits
1	Visvaldis Mangulis: Latvia in the Wars of the 20th Century Zetterberg, Seppo, in: Zeitschrift für Ostforschung, 34, 1985, S. 604-606 (Rezension)
2	Die finnisch-estnischen Unionspläne 1917-1919 Zetterberg, Seppo, in: Jahrbücher für Geschichte Osteuropas, 32, 1984, S. 517-540

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

Visvaldis Mangulis: Latvia in the Wars of the 20th Century

Die finnisch-estnischen Unionspläne 1917-1919