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  1. 1

    The pre-program earnings dip and the determinants of participation in a social program : implications for simple program evaluation strategies per Heckman, James J.

    Publicat 1999
    Llibre

    The pre-program earnings dip and the determinants of participation in a social program : implications for simple program evaluation strategies
  2. 2

    Innovation and market value per Hall, Bronwyn H.

    Publicat 1999
    Llibre

    Innovation and market value

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