@article{Prentice1978,
author = {Prentice, R.L. and Gloeckler, L.A.},
title= {Regression analysis of grouped survival data with applications to breast cancer data},
year = {1978},
doi = {10.2307/2529588},
journal = {Biometrics},
volume = {34},
number = {1},
pages = {57--67},
}