Carneiro, P.;    Lee, S.;      (2009)    Estimating distributions of potential outcomes using local instrumental variables with an application to changes in college enrollment and wage inequality.                   Journal of Econometrics , 149  (2)   pp. 191-208.    10.1016/j.jeconom.2009.01.011 <https://doi.org/10.1016/j.jeconom.2009.01.011>.       Green open access