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ISSN:0885-2545|21|2|119-127

Springer Publishing Company ‎(1997)‎

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By Battermann H.L.   Braulke M.   Broll U.   Schimmelpfennig J.   in Economics Letters

ISSN:0165-1765|66|1|85-91

Elsevier‎(2000)‎

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