//-->
The Common Structure of Tests for Selectivity Bias, Serial Correlation, Heteroscedaticity, and Non-normality in the Tobit Model.
Lee, Lung-Fei, (1985)
Asymptotic Covariance Matrices of Two-Stage Probit and Two-Stage Tobit Methods for Simultaneous Equations Models with Selectivity.
Lee, Lung-fei, (1980)
On the Asymptotic Properties of Some Two-Step Procedures for Estimating Distributed Lag Models.
Grether, David M, (1972)