1
Published: Luxemburg, [Veröffentlichungsdienste d. Europäischen Gemeinschaften], 1960
   
2
Published: Bochum, Berg-Verl, 1969
   
3
   
5
   
6
   
16
Published: Köln, Dt. Inst.-Verl., 1974
   
17
   
18
Published: Essen, Rhein.-Westf. Inst. f. Wirtschaftsforschung, 1966
   

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