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by Lo¨ffler, Philipp; Spahr, Clemens; Stievermann, Jan
by Sweeney, Douglas A.; Stievermann, Jan
by Stievermann, Jan; Goff, Philip; Junker, Detlef; et al.
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by Stievermann, Jan; Zachman, Randall C.
by Stievermann, Jan; Scheiding, Oliver