@article{Yashin1997,
author = {Yashin, A.I. and Manton, K.G. },
title= {Effects of unobserved and partially observed covariate processes on system failure: a review of models and estimation strategies},
year = {1997},
doi = {10.1214/ss/1029963259},
journal = {Statistical Science},
volume = {12},
number = {1},
pages = {20--34},
}