@article{Bickel1984,
author = {Bickel, P.J. and Freedman, D.A.},
title= {Asymptotic normality and the bootstrap in stratified sampling},
year = {1984},
doi = {10.1214/aos/1176346500},
journal = {The Annals of Statistics},
volume = {12},
number = {2},
pages = {470--482},
}