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Prerequisites versus difussion 

, In: American political science review / publ. quarterly by the American Political Science Association
testing alternative explanations of social security adoptio 
Collier, David ; Messick, Richard E.. (1975)  4 - p. 1299-1315
Exemplar:  Zentrale:E02 z pol 001/160; Zentrale:Magazin Zs fb 7160