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Salzhausen: iskopress, 2008
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Salzhausen: iskopress, 1994
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Hamburg: iskopress, 1991
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Paderborn: Junfermann, 1992
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Informa UK Limited, 2018
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Informa UK Limited, 2010
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Informa UK Limited, 2008
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Informa UK Limited, 2008
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Informa UK Limited, 2005
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Informa UK Limited, 2007
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Informa UK Limited, 2006
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Informa UK Limited, 1998
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Informa UK Limited, 1999
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Informa UK Limited, 2011
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Informa UK Limited, 2011