@Article{ATWZ00,
author={Roy Armoni and Amnon Ta-Shma and Avi
Wigderson and Shiyu Zhou},
title={An $\alpha(log(n)4/3)$ space
algorithm for (s,t) connectivity in
undirected graphs},
journal={Journal of the ACM},
volume={47},
month={2},
pages={294-311},
year={2000},
}