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by Busch, Birgit Schmidt Am; Gassner, Ulrich; Kersten, Jens; et al.
by Meyer, John M.; Kersten, Jens
by Kersten, Jens
by Kersten, Jens; Rixen, Stephan
by Battis, Ulrich; Kersten, Jens; Mitschang, Stephan
by Gassner, Ulrich; Kersten, Jens; Kruger, Matthias; et al.
by Jellinek, Georg; Kersten, Jens