- Author: Hans Peter Latscha, Uli Kazmaier, Helmut Klein
- Language: German
- Year: 2023
- Author: Martin A. Klein
- Language: English
- Year: 1998
- Author: Klein Eckart
- Language: German
- Year: 1998
Soziale Marktwirtschaft: Ein Modell für Europa. Festschrift für Gernot Gutmann zum 65. Geburtstag
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- Author: Klein Werner, Paraskewopoulos Spiridon, Winter Helmut
- Language: German
- Year: 1994
- Author: Klein Eckart
- Language: German
- Year: 1994
- Author: Klein-Blenkers Friedrich
- Language: German
- Year: 1991
- Author: Klein Eckart, Hacke Christian, Grzeszick Bernd, Isensee Josef
- Language: German
- Year: 2004
- Author: Klein Maren
- Language: German
- Year: 2019
- Author: Klein Eckart, Eckart Karl
- Language: German
- Year: 1996