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Industry effects and appropriability measures in the stock .. 

, In: The American economic review / publ. by the American Economic Association
Papers and proceedings of the ... annual meeting of the American Economic Association ; 100
Cockburn, Iain ; Griliches, Zvi. (1988)  2 - p. 419-423
Exemplar:  Zentrale:E02 z vwl 001 jc/649; Zentrale:Magazin Zs fc 1649