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1991
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KIT-Bibliothek, Karlsruhe, 1991-01-01
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KITopen (Karlsruhe Institute of Technologie), 2008-01-16
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Augsburg University Publication Server (OPUS), 2006-06-06
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Augsburg University Publication Server (OPUS), 2015-12-08
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Augsburg University Publication Server (OPUS), 2011-11-14
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Springer Berlin Heidelberg, 2005
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Springer Berlin Heidelberg, 2004
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Korean Institute of Information Scientists and Engineers, 2012