@article{Prentice1981,
author = {Prentice, R.L. and Williams, B.J. and Peterson, A.V.},
title= {On the regression analysis of multivariate failure time data},
year = {1981},
doi = {10.1093/biomet/68.2.373},
journal = {Biometrika},
volume = {68},
number = {2},
pages = {373--379},
}