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Work efforts before and after retirement under the social s.. 

, In: Public finance
On the role of budgetary policy during demographic changes, ed. by Barbara L. Wolfe;Proceedings of the ... congress of the International Institute of Public Finance ; 48
An, Jong beom. (1993)  - p. 269-292
Exemplar:  Zentrale:Magazin Zs fb 4703; Zentrale: Angeb.an fb 4703