By Donald S.G.   Newey W.K.   in Economics Letters

ISSN:0165-1765|67|3|239-243

Elsevier‎(2000)‎

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By Donald S.G.   Imbens G.W.   Newey W.K.   in Journal of Econometrics

ISSN:0304-4076|117|1|55-93

Elsevier‎(2003)‎

Access to resources Favorite 9.134396