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Lua i Stíl Chicago (17ú heag.)Eissa, Nada, agus Hilary Williamson Hoynes. The Earned Income Tax Credit and the Labor Supply of Married Couples. Cambridge: National Bureau of Economic Research, 1998.
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Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.