Lang Wu: "Simultaneous Inference for Longitudinal Data with Detection Limits and Covariates Measured with Errors, with Application to AIDS Studies", December 2001. 

Michael D. Perlman and Lang Wu: "On the Validity of the Likelihood Ratio and Maximum Likelihood Methods", November 2001. 

Lang Wu and Peter B. Gilbert: "Flexible Weighted Log-Rank Tests Optimal for Detecting Early and/or Late Survival Differences", July 2001.