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by Bergmann, Sigurd
by Luccarelli, Mark; Bergmann, Sigurd
by Deane-Drummond, Celia; Bergmann, Sigurd; Vogt, Markus; et al.
by Bergmann, Sigurd; Clingerman, Forrest
by Sigurd Bergmann
by Bergmann, Sigurd; Heimbrock, Hans-Gunter
by Bergmann, Sigurd; Kim, Yong-Bock
by Bergmann, Sigurd; Eaton, Heather
by Bergmann, Sigurd; Gerten, Dieter