@InProceedings{BGKRSW96,
author={Laszlo Babai and Anna Gal and Janos
Kollar and Lajos Ronyai and Tibor Szabo and
Avi Wigderson},
title={Extremal bipartite graphs and
superpolynomial lower bounds for monotone
span programs},
crossref={STOC28},
booktitle={Proceedings of the 28th STOC},
pages={603-611},
year={1996},
}