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Leipzig: CLIC, [2008]
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Berlin; Heidelberg [u.a.]: Springer, 1997
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Giessen: VVB Laufersweiler-Verl., 2010
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Gau-Algesheim: SecuMedia Verlag, [2017]
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Luxemburg: Office for Official Publ. of the European Communities, 2003 ; Thessaloniki: Cedefop, 2003
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Berlin: Schmidt, 2004
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Hannover: Hochschule Hannover, 2009
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Berlin: Duncker & Humblot, 1998
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Wiesbaden; [Heidelberg]: Springer Gabler, [2020]
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München: Hampp, 2007
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Weinheim: Beltz Juventa, 2020