@InProceedings{RVW00,
author={Omer Reingold and Salil Vadhan
and Avi Wigderson},
title={Entropy waves, the zig-zag graph
product, and new constant degree expanders
and extractors},
pages={3-13},
booktitle={Proceedings of the 41st FOCS},
crossref={FOCS41},
year={2000},
}