@article{Breslow2007,
author = {Breslow, N.E. and Wellner, J.A.},
title= {Weighted likelihood for semiparametric models and two-phase stratified samples, with application to Cox regression},
year = {2007},
doi = {10.1111/j.1467-9469.2006.00523.x},
volume = {34},
number = {1},
pages = {86--102},
}