search query: @author Heckman, J. J. / total: 9
references: 8-9 / 9
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title | year | author | ||
8. |
Review of Economic Studies
1980 : JAN, VOL. 47:146, p. 47-74 |
1980 | Heckman, J. J. Macurdy, T. E. |
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9. |
American Economic Review
1978 : 2 MAY VOL.68 p.200-207 |
1978 | Heckman, J. J. |
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