//-->
Some Identification Issues in Nonparametric Linear Models with Endogenous Regressors
Severini, Thomas A., (2005)
Efficiency bounds for estimating linear functionals of nonparametric regression models with endogenous regressors
Severini, Thomas A., (2007)
Semiparametric Efficiency Bounds for Microeconometric Models: A Survey
Severini, Thomas A., (2013)