Iterating von Neumann's Procedure for Extracting Random Bits. Peres, Y. Ann. Stat., 20(1):590–597, The Institute of Mathematical Statistics, March, 1992.
doi  bibtex   
@article{peres1992,
title        = {Iterating von {N}eumann's Procedure for Extracting Random Bits},
author       = {Peres, Yuval},
fjournal     = {Annals of Statistics},
journal      = {Ann. Stat.},
volume       = {20},
number       = {1},
pages        = {590--597},
month        = mar,
year         = {1992},
publisher    = {The Institute of Mathematical Statistics},
doi          = {10.1214/aos/1176348543},
}

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