Econometrica: Nov 1995, Volume 63, Issue 6
Notes and Comments: Nonparametric and Semiparametric Estimation with Discrete Regressors
https://doi.org/0012-9682(199511)63:6<1477:NASEWD>2.0.CO;2-4
p.
1477-1484
Juan Mora, Miguel A. Delgado
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