@article{Robins1995,
author = {Robins, J.M. and Rotnitzky, A. and Zhao, L.P.},
title= {Analysis of semiparametric regression models for repeated outcomes in the presence of missing data},
year = {1995},
doi = {10.1080/01621459.1995.10476493},
volume = {90},
number = {429},
pages = {106--121},
}