@article{Sastry1997,
author = {Sastry, N.},
title= {A Nested Frailty Model for Survival Data, with an Application to the Study of Child Survival in Northeast Brazil},
year = {1997},
doi = {10.1080/01621459.1997.10473994},
journal = {Journal of the American Statistical Association},
volume = {92},
number = {438},
pages = {426--435},
}